diff --git a/src/common-ssh/common-ssh/key.h b/src/common-ssh/common-ssh/key.h
index 4ed9bac..ca1ca3c 100644
--- a/src/common-ssh/common-ssh/key.h
+++ b/src/common-ssh/common-ssh/key.h
@@ -91,7 +91,7 @@
  * @return
  *     A statically-allocated string describing the most recent SSH key error.
  */
-const char* guac_common_ssh_key_error();
+const char* guac_common_ssh_key_error(void);
 
 /**
  * Frees all memory associated with the given key.
diff --git a/src/common-ssh/common-ssh/ssh.h b/src/common-ssh/common-ssh/ssh.h
index d5805b4..cec09a9 100644
--- a/src/common-ssh/common-ssh/ssh.h
+++ b/src/common-ssh/common-ssh/ssh.h
@@ -93,7 +93,7 @@
  * This function must be called once no other guac_common_ssh_*() functions
  * will be used.
  */
-void guac_common_ssh_uninit();
+void guac_common_ssh_uninit(void);
 
 /**
  * Connects to the SSH server running at the given hostname and port, and
diff --git a/src/common-ssh/key.c b/src/common-ssh/key.c
index a7f861d..f5448e4 100644
--- a/src/common-ssh/key.c
+++ b/src/common-ssh/key.c
@@ -157,7 +157,7 @@
 
 }
 
-const char* guac_common_ssh_key_error() {
+const char* guac_common_ssh_key_error(void) {
 
     /* Return static error string */
     return ERR_reason_error_string(ERR_get_error());
diff --git a/src/common-ssh/ssh.c b/src/common-ssh/ssh.c
index 582c3eb..7378946 100644
--- a/src/common-ssh/ssh.c
+++ b/src/common-ssh/ssh.c
@@ -111,7 +111,7 @@
  * @return
  *     An ID which uniquely identifies the current thread.
  */
-static unsigned long guac_common_ssh_openssl_id_callback() {
+static unsigned long guac_common_ssh_openssl_id_callback(void) {
     return (unsigned long) pthread_self();
 }
 
@@ -202,7 +202,7 @@
 
 }
 
-void guac_common_ssh_uninit() {
+void guac_common_ssh_uninit(void) {
 #ifdef OPENSSL_REQUIRES_THREADING_CALLBACKS
     guac_common_ssh_openssl_free_locks(CRYPTO_num_locks());
 #endif
diff --git a/src/common-ssh/tests/sftp/normalize_path.c b/src/common-ssh/tests/sftp/normalize_path.c
index df586c1..588a160 100644
--- a/src/common-ssh/tests/sftp/normalize_path.c
+++ b/src/common-ssh/tests/sftp/normalize_path.c
@@ -28,7 +28,7 @@
  * Test which verifies absolute Windows-style paths are correctly normalized to
  * absolute paths with UNIX separators and no relative components.
  */
-void test_sftp__normalize_absolute_windows() {
+void test_sftp__normalize_absolute_windows(void) {
 
     char normalized[GUAC_COMMON_SSH_SFTP_MAX_PATH];
 
@@ -56,7 +56,7 @@
  * Test which verifies absolute UNIX-style paths are correctly normalized to
  * absolute paths with UNIX separators and no relative components.
  */
-void test_sftp__normalize_absolute_unix() {
+void test_sftp__normalize_absolute_unix(void) {
 
     char normalized[GUAC_COMMON_SSH_SFTP_MAX_PATH];
 
@@ -85,7 +85,7 @@
  * separators are correctly normalized to absolute paths with UNIX separators
  * and no relative components.
  */
-void test_sftp__normalize_absolute_mixed() {
+void test_sftp__normalize_absolute_mixed(void) {
 
     char normalized[GUAC_COMMON_SSH_SFTP_MAX_PATH];
 
@@ -109,7 +109,7 @@
 /**
  * Test which verifies relative Windows-style paths are always rejected.
  */
-void test_sftp__normalize_relative_windows() {
+void test_sftp__normalize_relative_windows(void) {
 
     char normalized[GUAC_COMMON_SSH_SFTP_MAX_PATH];
 
@@ -128,7 +128,7 @@
 /**
  * Test which verifies relative UNIX-style paths are always rejected.
  */
-void test_sftp__normalize_relative_unix() {
+void test_sftp__normalize_relative_unix(void) {
 
     char normalized[GUAC_COMMON_SSH_SFTP_MAX_PATH];
 
@@ -148,7 +148,7 @@
  * Test which verifies relative paths consisting of mixed Windows and UNIX path
  * separators are always rejected.
  */
-void test_sftp__normalize_relative_mixed() {
+void test_sftp__normalize_relative_mixed(void) {
 
     char normalized[GUAC_COMMON_SSH_SFTP_MAX_PATH];
 
@@ -208,7 +208,7 @@
  * Test which verifies that paths exceeding the maximum path length are
  * rejected.
  */
-void test_sftp__normalize_long() {
+void test_sftp__normalize_long(void) {
 
     char* input;
     char normalized[GUAC_COMMON_SSH_SFTP_MAX_PATH];
@@ -234,7 +234,7 @@
  * Test which verifies that paths exceeding the maximum path depth are
  * rejected.
  */
-void test_sftp__normalize_deep() {
+void test_sftp__normalize_deep(void) {
 
     char* input;
     char normalized[GUAC_COMMON_SSH_SFTP_MAX_PATH];
diff --git a/src/common/common/list.h b/src/common/common/list.h
index f1a16a1..1dfa7f6 100644
--- a/src/common/common/list.h
+++ b/src/common/common/list.h
@@ -73,7 +73,7 @@
  *
  * @return A newly-allocated list.
  */
-guac_common_list* guac_common_list_alloc();
+guac_common_list* guac_common_list_alloc(void);
 
 /**
  * A handler that will be invoked with the data pointer of each element of
diff --git a/src/common/list.c b/src/common/list.c
index f101243..a32597a 100644
--- a/src/common/list.c
+++ b/src/common/list.c
@@ -25,7 +25,7 @@
 #include <stdlib.h>
 #include <pthread.h>
 
-guac_common_list* guac_common_list_alloc() {
+guac_common_list* guac_common_list_alloc(void) {
 
     guac_common_list* list = guac_mem_alloc(sizeof(guac_common_list));
 
diff --git a/src/common/surface.c b/src/common/surface.c
index 3ec5517..95acd27 100644
--- a/src/common/surface.c
+++ b/src/common/surface.c
@@ -1895,7 +1895,6 @@
     guac_common_surface_bitmap_rect* current = surface->bitmap_queue;
     int i, j;
     int original_queue_length;
-    int flushed = 0;
 
     original_queue_length = surface->bitmap_queue_length;
 
@@ -1943,8 +1942,6 @@
             /* Flush as bitmap otherwise */
             else if (surface->dirty) {
 
-                flushed++;
-
                 int opaque = __guac_common_surface_is_opaque(surface,
                             &surface->dirty_rect);
 
diff --git a/src/common/tests/iconv/convert.c b/src/common/tests/iconv/convert.c
index d177ba0..760cf0a 100644
--- a/src/common/tests/iconv/convert.c
+++ b/src/common/tests/iconv/convert.c
@@ -72,7 +72,7 @@
  * to every other supported encoding, with all line endings preserved verbatim
  * (not normalized).
  */
-void test_iconv__preserve() {
+void test_iconv__preserve(void) {
     for (int i = 0; i < NUM_SUPPORTED_ENCODINGS; i++) {
         for (int j = 0; j < NUM_SUPPORTED_ENCODINGS; j++) {
 
@@ -92,7 +92,7 @@
  * to every other supported encoding, normalizing all line endings to
  * Unix-style line endings.
  */
-void test_iconv__normalize_unix() {
+void test_iconv__normalize_unix(void) {
     for (int i = 0; i < NUM_SUPPORTED_ENCODINGS; i++) {
         for (int j = 0; j < NUM_SUPPORTED_ENCODINGS; j++) {
 
@@ -112,7 +112,7 @@
  * to every other supported encoding, normalizing all line endings to
  * Windows-style line endings.
  */
-void test_iconv__normalize_crlf() {
+void test_iconv__normalize_crlf(void) {
     for (int i = 0; i < NUM_SUPPORTED_ENCODINGS; i++) {
         for (int j = 0; j < NUM_SUPPORTED_ENCODINGS; j++) {
 
diff --git a/src/common/tests/rect/clip_and_split.c b/src/common/tests/rect/clip_and_split.c
index e286bce..7b7f4da 100644
--- a/src/common/tests/rect/clip_and_split.c
+++ b/src/common/tests/rect/clip_and_split.c
@@ -25,7 +25,7 @@
  * Test which verifies that guac_common_rect_clip_and_split() divides a
  * rectangle into subrectangles after removing a "hole" rectangle.
  */
-void test_rect__clip_and_split() {
+void test_rect__clip_and_split(void) {
 
     int res;
 
diff --git a/src/common/tests/rect/constrain.c b/src/common/tests/rect/constrain.c
index 793aac2..6bddc14 100644
--- a/src/common/tests/rect/constrain.c
+++ b/src/common/tests/rect/constrain.c
@@ -25,7 +25,7 @@
  * Test which verifies that guac_common_rect_constrain() restricts a given
  * rectangle to arbitrary bounds.
  */
-void test_rect__constrain() {
+void test_rect__constrain(void) {
 
     guac_common_rect max;
     guac_common_rect rect;
diff --git a/src/common/tests/rect/expand_to_grid.c b/src/common/tests/rect/expand_to_grid.c
index beef87d..46b7efa 100644
--- a/src/common/tests/rect/expand_to_grid.c
+++ b/src/common/tests/rect/expand_to_grid.c
@@ -25,7 +25,7 @@
  * Test which verifies guac_common_rect_expand_to_grid() properly shifts and
  * resizes rectangles to fit an NxN grid.
  */
-void test_rect__expand_to_grid() {
+void test_rect__expand_to_grid(void) {
 
     int cell_size = 16;
 
diff --git a/src/common/tests/rect/extend.c b/src/common/tests/rect/extend.c
index dc2a0e3..8fb92f7 100644
--- a/src/common/tests/rect/extend.c
+++ b/src/common/tests/rect/extend.c
@@ -25,7 +25,7 @@
  * Test which verifies that guac_common_rect_extend() expands the given
  * rectangle as necessary to contain at least the given bounds.
  */
-void test_rect__extend() {
+void test_rect__extend(void) {
 
     guac_common_rect max;
     guac_common_rect rect;
diff --git a/src/common/tests/rect/init.c b/src/common/tests/rect/init.c
index 288cd75..345a245 100644
--- a/src/common/tests/rect/init.c
+++ b/src/common/tests/rect/init.c
@@ -24,7 +24,7 @@
 /**
  * Test which verifies rectangle initialization via guac_common_rect_init().
  */
-void test_rect__init() {
+void test_rect__init(void) {
 
     guac_common_rect max;
 
diff --git a/src/common/tests/rect/intersects.c b/src/common/tests/rect/intersects.c
index c480268..31b6d61 100644
--- a/src/common/tests/rect/intersects.c
+++ b/src/common/tests/rect/intersects.c
@@ -24,7 +24,7 @@
 /**
  * Test which verifies intersection testing via guac_common_rect_intersects().
  */
-void test_rect__intersects() {
+void test_rect__intersects(void) {
 
     int res;
 
diff --git a/src/common/tests/string/count_occurrences.c b/src/common/tests/string/count_occurrences.c
index 0c7d01d..3cdef7e 100644
--- a/src/common/tests/string/count_occurrences.c
+++ b/src/common/tests/string/count_occurrences.c
@@ -25,7 +25,7 @@
  * Test which verifies that guac_count_occurrences() counts the number of
  * occurrences of an arbitrary character within a given string.
  */
-void test_string__guac_count_occurrences() {
+void test_string__guac_count_occurrences(void) {
     CU_ASSERT_EQUAL(4, guac_count_occurrences("this is a test string", 's'));
     CU_ASSERT_EQUAL(3, guac_count_occurrences("this is a test string", 'i'));
     CU_ASSERT_EQUAL(0, guac_count_occurrences("", 's'));
diff --git a/src/common/tests/string/split.c b/src/common/tests/string/split.c
index d774018..15027fc 100644
--- a/src/common/tests/string/split.c
+++ b/src/common/tests/string/split.c
@@ -28,7 +28,7 @@
  * Test which verifies that guac_split() splits a string on occurrences of a
  * given character.
  */
-void test_string__split() {
+void test_string__split(void) {
 
     /* Split test string */
     char** tokens = guac_split("this is a test string", ' ');
diff --git a/src/guacd/conf-file.c b/src/guacd/conf-file.c
index ed74dcb..f4578ba 100644
--- a/src/guacd/conf-file.c
+++ b/src/guacd/conf-file.c
@@ -171,7 +171,7 @@
 
 }
 
-guacd_config* guacd_conf_load() {
+guacd_config* guacd_conf_load(void) {
 
     guacd_config* conf = guac_mem_alloc(sizeof(guacd_config));
     if (conf == NULL)
diff --git a/src/guacd/conf-file.h b/src/guacd/conf-file.h
index c38d859..ff30d37 100644
--- a/src/guacd/conf-file.h
+++ b/src/guacd/conf-file.h
@@ -35,7 +35,7 @@
  * Loads the configuration from any of several default locations, if found. If
  * parsing fails, NULL is returned, and an error message is printed to stderr.
  */
-guacd_config* guacd_conf_load();
+guacd_config* guacd_conf_load(void);
 
 #endif
 
diff --git a/src/guacd/daemon.c b/src/guacd/daemon.c
index 251d348..d83937e 100644
--- a/src/guacd/daemon.c
+++ b/src/guacd/daemon.c
@@ -101,7 +101,7 @@
  *    still the original caller. This function does not return for the original
  *    caller if daemonization succeeds.
  */
-static int daemonize() {
+static int daemonize(void) {
 
     pid_t pid;
 
@@ -202,7 +202,7 @@
  * @return
  *     An ID which uniquely identifies the current thread.
  */
-static unsigned long guacd_openssl_id_callback() {
+static unsigned long guacd_openssl_id_callback(void) {
     return (unsigned long) pthread_self();
 }
 
diff --git a/src/guacd/log.c b/src/guacd/log.c
index 81c313b..8adc86c 100644
--- a/src/guacd/log.c
+++ b/src/guacd/log.c
@@ -130,7 +130,7 @@
 
 }
 
-void guacd_log_handshake_failure() {
+void guacd_log_handshake_failure(void) {
 
     if (guac_error == GUAC_STATUS_CLOSED)
         guacd_log(GUAC_LOG_DEBUG,
diff --git a/src/guacd/log.h b/src/guacd/log.h
index c00fa82..0bcf3a6 100644
--- a/src/guacd/log.h
+++ b/src/guacd/log.h
@@ -65,7 +65,7 @@
  * Logs a reasonable explanatory message regarding handshake failure based on
  * the current value of guac_error.
  */
-void guacd_log_handshake_failure();
+void guacd_log_handshake_failure(void);
 
 #endif
 
diff --git a/src/guacd/proc-map.c b/src/guacd/proc-map.c
index ea5f2e9..9a246e7 100644
--- a/src/guacd/proc-map.c
+++ b/src/guacd/proc-map.c
@@ -128,7 +128,7 @@
 
 }
 
-guacd_proc_map* guacd_proc_map_alloc() {
+guacd_proc_map* guacd_proc_map_alloc(void) {
 
     guacd_proc_map* map = guac_mem_alloc(sizeof(guacd_proc_map));
     map->processes = guac_common_list_alloc();
diff --git a/src/guacd/proc-map.h b/src/guacd/proc-map.h
index adce8cf..467ece6 100644
--- a/src/guacd/proc-map.h
+++ b/src/guacd/proc-map.h
@@ -63,7 +63,7 @@
  * @return
  *     A newly-allocated client process map.
  */
-guacd_proc_map* guacd_proc_map_alloc();
+guacd_proc_map* guacd_proc_map_alloc(void);
 
 /**
  * Free all resources allocated for the provided map. Note that this function
diff --git a/src/guacd/proc.c b/src/guacd/proc.c
index 2c38712..78349ae 100644
--- a/src/guacd/proc.c
+++ b/src/guacd/proc.c
@@ -150,7 +150,7 @@
  * a process which does not have a PGID separate from the main guacd process
  * can result in guacd itself being terminated.
  */
-static void guacd_kill_current_proc_group() {
+static void guacd_kill_current_proc_group(void) {
 
     /* Forcibly kill all children within process group */
     if (kill(0, SIGKILL))
diff --git a/src/guacenc/buffer.c b/src/guacenc/buffer.c
index eace8aa..f4e3ce6 100644
--- a/src/guacenc/buffer.c
+++ b/src/guacenc/buffer.c
@@ -26,7 +26,7 @@
 #include <assert.h>
 #include <stdlib.h>
 
-guacenc_buffer* guacenc_buffer_alloc() {
+guacenc_buffer* guacenc_buffer_alloc(void) {
     return guac_mem_zalloc(sizeof(guacenc_buffer));
 }
 
diff --git a/src/guacenc/buffer.h b/src/guacenc/buffer.h
index 9ce339c..016a355 100644
--- a/src/guacenc/buffer.h
+++ b/src/guacenc/buffer.h
@@ -82,7 +82,7 @@
  *     A newly-allocated and initialized guacenc_buffer, or NULL if allocation
  *     fails.
  */
-guacenc_buffer* guacenc_buffer_alloc();
+guacenc_buffer* guacenc_buffer_alloc(void);
 
 /**
  * Frees all memory associated with the given buffer object. If the buffer
diff --git a/src/guacenc/cursor.c b/src/guacenc/cursor.c
index e47f44c..cad56b1 100644
--- a/src/guacenc/cursor.c
+++ b/src/guacenc/cursor.c
@@ -25,7 +25,7 @@
 
 #include <stdlib.h>
 
-guacenc_cursor* guacenc_cursor_alloc() {
+guacenc_cursor* guacenc_cursor_alloc(void) {
 
     /* Allocate new cursor */
     guacenc_cursor* cursor = (guacenc_cursor*) guac_mem_alloc(sizeof(guacenc_cursor));
diff --git a/src/guacenc/cursor.h b/src/guacenc/cursor.h
index 80f4729..46d684f 100644
--- a/src/guacenc/cursor.h
+++ b/src/guacenc/cursor.h
@@ -72,7 +72,7 @@
  *     A newly-allocated and initialized guacenc_cursor, or NULL if allocation
  *     fails.
  */
-guacenc_cursor* guacenc_cursor_alloc();
+guacenc_cursor* guacenc_cursor_alloc(void);
 
 /**
  * Frees all memory associated with the given cursor object. If the cursor
diff --git a/src/guacenc/layer.c b/src/guacenc/layer.c
index 7a81fc5..9ebf152 100644
--- a/src/guacenc/layer.c
+++ b/src/guacenc/layer.c
@@ -25,7 +25,7 @@
 
 #include <stdlib.h>
 
-guacenc_layer* guacenc_layer_alloc() {
+guacenc_layer* guacenc_layer_alloc(void) {
 
     /* Allocate new layer */
     guacenc_layer* layer = (guacenc_layer*) guac_mem_zalloc(sizeof(guacenc_layer));
diff --git a/src/guacenc/layer.h b/src/guacenc/layer.h
index af247c8..b191bd8 100644
--- a/src/guacenc/layer.h
+++ b/src/guacenc/layer.h
@@ -88,7 +88,7 @@
  *     A newly-allocated and initialized guacenc_layer, or NULL if allocation
  *     fails.
  */
-guacenc_layer* guacenc_layer_alloc();
+guacenc_layer* guacenc_layer_alloc(void);
 
 /**
  * Frees all memory associated with the given layer object. If the layer
diff --git a/src/libguac/argv.c b/src/libguac/argv.c
index 98eb49c..8df173d 100644
--- a/src/libguac/argv.c
+++ b/src/libguac/argv.c
@@ -316,7 +316,7 @@
 
 }
 
-void guac_argv_stop() {
+void guac_argv_stop(void) {
     pthread_mutex_lock(&await_state.lock);
 
     /* Signal any waiting threads that no further argument values will be
diff --git a/src/libguac/client.c b/src/libguac/client.c
index 5926e9c..76dc67a 100644
--- a/src/libguac/client.c
+++ b/src/libguac/client.c
@@ -251,7 +251,7 @@
 
 }
 
-guac_client* guac_client_alloc() {
+guac_client* guac_client_alloc(void) {
 
     int i;
 
diff --git a/src/libguac/display.c b/src/libguac/display.c
index f4a0f65..00c6c76 100644
--- a/src/libguac/display.c
+++ b/src/libguac/display.c
@@ -56,7 +56,7 @@
  *     The number of available processors, or zero if this value cannot be
  *     determined for any reason.
  */
-static unsigned long guac_display_nproc() {
+static unsigned long guac_display_nproc(void) {
 
 #if defined(HAVE_SCHED_GETAFFINITY)
 
diff --git a/src/libguac/error.c b/src/libguac/error.c
index 9be6ca0..f0b291a 100644
--- a/src/libguac/error.c
+++ b/src/libguac/error.c
@@ -184,21 +184,21 @@
 
 }
 
-static void __guac_alloc_error_key() {
+static void __guac_alloc_error_key(void) {
 
     /* Create key, destroy any allocated variable on thread exit */
     pthread_key_create(&__guac_error_key, __guac_mem_free_pointer);
 
 }
 
-static void __guac_alloc_error_message_key() {
+static void __guac_alloc_error_message_key(void) {
 
     /* Create key, destroy any allocated variable on thread exit */
     pthread_key_create(&__guac_error_message_key, __guac_mem_free_pointer);
 
 }
 
-guac_status* __guac_error() {
+guac_status* __guac_error(void) {
 
     /* Pointer for thread-local data */
     guac_status* status;
@@ -219,7 +219,7 @@
 
 }
 
-const char** __guac_error_message() {
+const char** __guac_error_message(void) {
 
     /* Pointer for thread-local data */
     const char** message;
@@ -249,11 +249,11 @@
 static guac_status __guac_error_unsafe_storage;
 static const char** __guac_error_message_unsafe_storage;
 
-guac_status* __guac_error() {
+guac_status* __guac_error(void) {
     return &__guac_error_unsafe_storage;
 }
 
-const char** __guac_error_message() {
+const char** __guac_error_message(void) {
     return &__guac_error_message_unsafe_storage;
 }
 
diff --git a/src/libguac/fips.c b/src/libguac/fips.c
index b087e11..fc1b45f 100644
--- a/src/libguac/fips.c
+++ b/src/libguac/fips.c
@@ -44,7 +44,7 @@
 #define GUAC_FIPS_ENABLED 0
 #endif
 
-int guac_fips_enabled() {
+int guac_fips_enabled(void) {
 
     return GUAC_FIPS_ENABLED;
 
diff --git a/src/libguac/guacamole/argv.h b/src/libguac/guacamole/argv.h
index 3cc4806..aa5c586 100644
--- a/src/libguac/guacamole/argv.h
+++ b/src/libguac/guacamole/argv.h
@@ -114,7 +114,7 @@
  * guac_argv_await() that is currently blocking will return, and any future
  * calls to guac_argv_await() will return immediately without blocking.
  */
-void guac_argv_stop();
+void guac_argv_stop(void);
 
 /**
  * Convenience implementation of the "argv" instruction handler which
diff --git a/src/libguac/guacamole/client.h b/src/libguac/guacamole/client.h
index 01ecbc8..4b311f1 100644
--- a/src/libguac/guacamole/client.h
+++ b/src/libguac/guacamole/client.h
@@ -319,7 +319,7 @@
  *
  * @return A pointer to the new client.
  */
-guac_client* guac_client_alloc();
+guac_client* guac_client_alloc(void);
 
 /**
  * Free all resources associated with the given client.
diff --git a/src/libguac/guacamole/error.h b/src/libguac/guacamole/error.h
index 5fdf558..acf519b 100644
--- a/src/libguac/guacamole/error.h
+++ b/src/libguac/guacamole/error.h
@@ -44,7 +44,7 @@
  */
 #define guac_error (*__guac_error())
 
-guac_status* __guac_error();
+guac_status* __guac_error(void);
 
 /**
  * Returns a message describing the error which occurred during the last
@@ -57,7 +57,7 @@
  */
 #define guac_error_message (*__guac_error_message())
 
-const char** __guac_error_message();
+const char** __guac_error_message(void);
 
 /**
  * Returns a human-readable explanation of the status code given.
@@ -74,7 +74,7 @@
  */
 #define guac_error (*__guac_error())
 
-guac_status* __guac_error();
+guac_status* __guac_error(void);
 
 /**
  * Returns a message describing the error which occurred during the last
@@ -87,7 +87,7 @@
  */
 #define guac_error_message (*__guac_error_message())
 
-const char** __guac_error_message();
+const char** __guac_error_message(void);
 
 #endif
 
diff --git a/src/libguac/guacamole/fips.h b/src/libguac/guacamole/fips.h
index 014f7dc..780fc02 100644
--- a/src/libguac/guacamole/fips.h
+++ b/src/libguac/guacamole/fips.h
@@ -28,6 +28,6 @@
  *      A non-zero value if FIPS mode is enabled, or zero if FIPS mode is
  *      not enabled.
  */
-int guac_fips_enabled();
+int guac_fips_enabled(void);
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/libguac/guacamole/parser.h b/src/libguac/guacamole/parser.h
index a5a1a08..b6fb0bd 100644
--- a/src/libguac/guacamole/parser.h
+++ b/src/libguac/guacamole/parser.h
@@ -93,7 +93,7 @@
  * @return The newly allocated parser, or NULL if an error occurs during
  *         allocation, in which case guac_error will be set appropriately.
  */
-guac_parser* guac_parser_alloc();
+guac_parser* guac_parser_alloc(void);
 
 /**
  * Appends data from the given buffer to the given parser. The data will be
diff --git a/src/libguac/guacamole/socket.h b/src/libguac/guacamole/socket.h
index 6075f39..75d5432 100644
--- a/src/libguac/guacamole/socket.h
+++ b/src/libguac/guacamole/socket.h
@@ -127,7 +127,7 @@
  * @returns A newly-allocated guac_socket, or NULL if the guac_socket could
  *          not be allocated.
  */
-guac_socket* guac_socket_alloc();
+guac_socket* guac_socket_alloc(void);
 
 /**
  * Frees the given guac_socket and all associated resources.
diff --git a/src/libguac/guacamole/timestamp.h b/src/libguac/guacamole/timestamp.h
index 6789415..d3fe90d 100644
--- a/src/libguac/guacamole/timestamp.h
+++ b/src/libguac/guacamole/timestamp.h
@@ -37,7 +37,7 @@
  * @return
  *     An arbitrary millisecond timestamp.
  */
-guac_timestamp guac_timestamp_current();
+guac_timestamp guac_timestamp_current(void);
 
 /**
  * Sleeps for the given number of milliseconds.
diff --git a/src/libguac/guacamole/user.h b/src/libguac/guacamole/user.h
index 13fb146..4531e75 100644
--- a/src/libguac/guacamole/user.h
+++ b/src/libguac/guacamole/user.h
@@ -546,7 +546,7 @@
  *
  * @return The newly allocated guac_user, or NULL if allocation failed.
  */
-guac_user* guac_user_alloc();
+guac_user* guac_user_alloc(void);
 
 /**
  * Frees the given user and all associated resources.
diff --git a/src/libguac/parser.c b/src/libguac/parser.c
index 0a03119..b5ae3ea 100644
--- a/src/libguac/parser.c
+++ b/src/libguac/parser.c
@@ -37,7 +37,7 @@
     parser->__element_length = 0;
 }
 
-guac_parser* guac_parser_alloc() {
+guac_parser* guac_parser_alloc(void) {
 
     /* Allocate space for parser */
     guac_parser* parser = guac_mem_alloc(sizeof(guac_parser));
diff --git a/src/libguac/socket.c b/src/libguac/socket.c
index b7a4b77..fedc7f9 100644
--- a/src/libguac/socket.c
+++ b/src/libguac/socket.c
@@ -140,7 +140,7 @@
 
 }
 
-guac_socket* guac_socket_alloc() {
+guac_socket* guac_socket_alloc(void) {
 
     guac_socket* socket = guac_mem_alloc(sizeof(guac_socket));
 
diff --git a/src/libguac/tests/client/buffer_pool.c b/src/libguac/tests/client/buffer_pool.c
index 4f3b3c1..967e62a 100644
--- a/src/libguac/tests/client/buffer_pool.c
+++ b/src/libguac/tests/client/buffer_pool.c
@@ -28,7 +28,7 @@
  * of buffers available to each guac_client, and that doing so does not disturb
  * the similar pool of layers.
  */
-void test_client__buffer_pool() {
+void test_client__buffer_pool(void) {
 
     guac_client* client;
 
diff --git a/src/libguac/tests/client/layer_pool.c b/src/libguac/tests/client/layer_pool.c
index f82e84f..c3a4bd9 100644
--- a/src/libguac/tests/client/layer_pool.c
+++ b/src/libguac/tests/client/layer_pool.c
@@ -28,7 +28,7 @@
  * of layers available to each guac_client, and that doing so does not disturb
  * the similar pool of buffers.
  */
-void test_client__layer_pool() {
+void test_client__layer_pool(void) {
 
     guac_client* client;
 
diff --git a/src/libguac/tests/fifo/fifo.c b/src/libguac/tests/fifo/fifo.c
index 67617e2..c5e4545 100644
--- a/src/libguac/tests/fifo/fifo.c
+++ b/src/libguac/tests/fifo/fifo.c
@@ -258,7 +258,7 @@
  * Verify that the base fifo implementation functions correctly when events
  * are sent slower than they are read.
  */
-void test_fifo__slow_add() {
+void test_fifo__slow_add(void) {
 
     /* Add context for subsequent logging of sent/received values to STDOUT */
     printf("-------- %s() --------\n", __func__);
@@ -272,7 +272,7 @@
  * Verify that the base fifo implementation functions correctly when events
  * are sent faster than they are read.
  */
-void test_fifo__fast_add() {
+void test_fifo__fast_add(void) {
 
     /* Add context for subsequent logging of sent/received values to STDOUT */
     printf("-------- %s() --------\n", __func__);
@@ -286,7 +286,7 @@
  * Verify that the base fifo implementation functions correctly when events
  * are sent at roughly the same speed as the reading thread.
  */
-void test_fifo__interleaved() {
+void test_fifo__interleaved(void) {
 
     /* Add context for subsequent logging of sent/received values to STDOUT */
     printf("-------- %s() --------\n", __func__);
diff --git a/src/libguac/tests/file/openat.c b/src/libguac/tests/file/openat.c
index 146f7f0..5e5a807 100644
--- a/src/libguac/tests/file/openat.c
+++ b/src/libguac/tests/file/openat.c
@@ -196,7 +196,7 @@
  * Verify general guac_openat() behavior when creating files within
  * directories, optionally first creating that directory.
  */
-void test_file__openat() {
+void test_file__openat(void) {
 
     int fd;
     char filename[1024];
@@ -309,7 +309,7 @@
  * Verify guac_openat() behavior when the filename provided contains path
  * components.
  */
-void test_file__openat_not_filename() {
+void test_file__openat_not_filename(void) {
 
     int fd;
 
@@ -350,7 +350,7 @@
 /**
  * Verify guac_openat() behavior when locking is requested vs. not requested.
  */
-void test_file__openat_locked() {
+void test_file__openat_locked(void) {
 #ifdef __MINGW32__
     /* Skipped under Windows platforms (see documentation for GUAC_O_LOCKED) */
 #else
diff --git a/src/libguac/tests/flag/flag.c b/src/libguac/tests/flag/flag.c
index c822a6a..1ff23a8 100644
--- a/src/libguac/tests/flag/flag.c
+++ b/src/libguac/tests/flag/flag.c
@@ -111,7 +111,7 @@
  * Verifies that a thread waiting on a particular event will NOT be notified if
  * absolutely zero events ever occur.
  */
-void test_flag__ignore_total_silence() {
+void test_flag__ignore_total_silence(void) {
 
     guac_flag test_flag;
     guac_flag_init(&test_flag);
@@ -127,7 +127,7 @@
  * Verifies that a thread waiting on a particular event will NOT be notified if
  * that event never occurs, even if other events are occurring.
  */
-void test_flag__ignore_uninteresting_events() {
+void test_flag__ignore_uninteresting_events(void) {
 
     guac_flag test_flag;
     guac_flag_init(&test_flag);
@@ -146,7 +146,7 @@
  * Verifies that a thread waiting on a particular event will be notified when
  * that event occurs.
  */
-void test_flag__wake_for_interesting_events() {
+void test_flag__wake_for_interesting_events(void) {
 
     guac_flag test_flag;
     guac_flag_init(&test_flag);
diff --git a/src/libguac/tests/id/generate.c b/src/libguac/tests/id/generate.c
index 4f369fd..dfe07b6 100644
--- a/src/libguac/tests/id/generate.c
+++ b/src/libguac/tests/id/generate.c
@@ -29,7 +29,7 @@
  * Test which verifies that each call to guac_generate_id() produces a
  * different string.
  */
-void test_id__unique() {
+void test_id__unique(void) {
 
     char* id1 = guac_generate_id('x');
     char* id2 = guac_generate_id('x');
@@ -50,7 +50,7 @@
  * Test which verifies that guac_generate_id() produces strings are in the
  * correct UUID-based format.
  */
-void test_id__format() {
+void test_id__format(void) {
 
     unsigned int ignore;
 
@@ -71,7 +71,7 @@
  * Test which verifies that guac_generate_id() takes the specified prefix
  * character into account when generating the ID string.
  */
-void test_id__prefix() {
+void test_id__prefix(void) {
 
     char* id;
     
diff --git a/src/libguac/tests/mem/alloc.c b/src/libguac/tests/mem/alloc.c
index bec3145..0332560 100644
--- a/src/libguac/tests/mem/alloc.c
+++ b/src/libguac/tests/mem/alloc.c
@@ -25,7 +25,7 @@
  * Test which verifies that guac_mem_alloc() returns NULL for all inputs involving
  * at least one zero value.
  */
-void test_mem__alloc_fail_zero() {
+void test_mem__alloc_fail_zero(void) {
 
     CU_ASSERT_PTR_NULL(guac_mem_alloc(0));
     CU_ASSERT_PTR_NULL(guac_mem_alloc(0, 0));
@@ -44,7 +44,7 @@
  * Test which verifies that guac_mem_alloc() successfully allocates blocks of
  * memory for inputs that can reasonably be expected to succeed.
  */
-void test_mem__alloc_success() {
+void test_mem__alloc_success(void) {
 
     void* ptr;
 
@@ -66,7 +66,7 @@
  * Test which verifies that guac_mem_alloc() fails to allocate blocks of memory
  * that exceed the capacity of a size_t.
  */
-void test_mem__alloc_fail_large() {
+void test_mem__alloc_fail_large(void) {
     CU_ASSERT_PTR_NULL(guac_mem_alloc(123, 456, SIZE_MAX));
     CU_ASSERT_PTR_NULL(guac_mem_alloc(SIZE_MAX / 2, SIZE_MAX / 2));
 }
diff --git a/src/libguac/tests/mem/ckd_add.c b/src/libguac/tests/mem/ckd_add.c
index f24e624..1acf29f 100644
--- a/src/libguac/tests/mem/ckd_add.c
+++ b/src/libguac/tests/mem/ckd_add.c
@@ -25,7 +25,7 @@
  * Test which verifies that guac_mem_ckd_add() calculates results correctly for
  * all inputs involving at least one zero value.
  */
-void test_mem__ckd_add_zero() {
+void test_mem__ckd_add_zero(void) {
 
     size_t result = SIZE_MAX;
 
@@ -65,7 +65,7 @@
  * Test which verifies that guac_mem_ckd_add() successfully calculates expected
  * values for relatively small integer inputs.
  */
-void test_mem__ckd_add_small() {
+void test_mem__ckd_add_small(void) {
 
     size_t result = SIZE_MAX;
 
@@ -85,7 +85,7 @@
  * relatively large integer inputs, including inputs that cause overflow beyond
  * the capacity of a size_t.
  */
-void test_mem__ckd_add_large() {
+void test_mem__ckd_add_large(void) {
 
     size_t result = 0;
 
diff --git a/src/libguac/tests/mem/ckd_add_or_die.c b/src/libguac/tests/mem/ckd_add_or_die.c
index 497bfe3..e64ee43 100644
--- a/src/libguac/tests/mem/ckd_add_or_die.c
+++ b/src/libguac/tests/mem/ckd_add_or_die.c
@@ -27,7 +27,7 @@
  * Test which verifies that guac_mem_ckd_add_or_die() calculates results
  * correctly for all inputs involving at least one zero value.
  */
-void test_mem__ckd_add_or_die_zero() {
+void test_mem__ckd_add_or_die_zero(void) {
 
     CU_ASSERT_EQUAL(guac_mem_ckd_add_or_die(0), 0);
     CU_ASSERT_EQUAL(guac_mem_ckd_add_or_die(0, 0), 0);
@@ -46,7 +46,7 @@
  * Test which verifies that guac_mem_ckd_add_or_die() successfully calculates
  * expected values for relatively small integer inputs.
  */
-void test_mem__ckd_add_or_die_small() {
+void test_mem__ckd_add_or_die_small(void) {
 
     CU_ASSERT_EQUAL(guac_mem_ckd_add_or_die(123), 123);
     CU_ASSERT_EQUAL(guac_mem_ckd_add_or_die(123, 456), 123 + 456);
@@ -59,7 +59,7 @@
  * relatively large integer inputs, including inputs that cause overflow beyond
  * the capacity of a size_t.
  */
-void test_mem__ckd_add_or_die_large() {
+void test_mem__ckd_add_or_die_large(void) {
 
     CU_ASSERT_EQUAL(guac_mem_ckd_add_or_die(SIZE_MAX), SIZE_MAX);
     CU_ASSERT_EQUAL(guac_mem_ckd_add_or_die(SIZE_MAX / 2, SIZE_MAX / 2), (SIZE_MAX / 2) * 2);
diff --git a/src/libguac/tests/mem/ckd_mul.c b/src/libguac/tests/mem/ckd_mul.c
index 847c6f1..9dc1a23 100644
--- a/src/libguac/tests/mem/ckd_mul.c
+++ b/src/libguac/tests/mem/ckd_mul.c
@@ -25,7 +25,7 @@
  * Test which verifies that guac_mem_ckd_mul() calculates zero values for all
  * inputs involving at least one zero value.
  */
-void test_mem__ckd_mul_zero() {
+void test_mem__ckd_mul_zero(void) {
 
     size_t result = SIZE_MAX;
 
@@ -65,7 +65,7 @@
  * Test which verifies that guac_mem_ckd_mul() successfully calculates expected
  * values for relatively small integer inputs.
  */
-void test_mem__ckd_mul_small() {
+void test_mem__ckd_mul_small(void) {
 
     size_t result = SIZE_MAX;
 
@@ -85,7 +85,7 @@
  * relatively large integer inputs, including inputs that cause overflow beyond
  * the capacity of a size_t.
  */
-void test_mem__ckd_mul_large() {
+void test_mem__ckd_mul_large(void) {
 
     size_t result = 0;
 
diff --git a/src/libguac/tests/mem/ckd_mul_or_die.c b/src/libguac/tests/mem/ckd_mul_or_die.c
index c4ba759..0e98647 100644
--- a/src/libguac/tests/mem/ckd_mul_or_die.c
+++ b/src/libguac/tests/mem/ckd_mul_or_die.c
@@ -27,7 +27,7 @@
  * Test which verifies that guac_mem_ckd_mul_or_die() calculates zero values
  * for all inputs involving at least one zero value.
  */
-void test_mem__ckd_mul_or_die_zero() {
+void test_mem__ckd_mul_or_die_zero(void) {
 
     CU_ASSERT_EQUAL(guac_mem_ckd_mul_or_die(0), 0);
     CU_ASSERT_EQUAL(guac_mem_ckd_mul_or_die(0, 0), 0);
@@ -47,7 +47,7 @@
  * Test which verifies that guac_mem_ckd_mul_or_die() successfully calculates
  * expected values for relatively small integer inputs.
  */
-void test_mem__ckd_mul_or_die_small() {
+void test_mem__ckd_mul_or_die_small(void) {
     CU_ASSERT_EQUAL(guac_mem_ckd_mul_or_die(123), 123);
     CU_ASSERT_EQUAL(guac_mem_ckd_mul_or_die(123, 456), 123 * 456);
     CU_ASSERT_EQUAL(guac_mem_ckd_mul_or_die(123, 456, 789), 123 * 456 * 789);
@@ -57,7 +57,7 @@
  * Test which verifies that guac_mem_ckd_mul_or_die() behaves as expected for
  * relatively large integer inputs.
  */
-void test_mem__ckd_mul_or_die_large() {
+void test_mem__ckd_mul_or_die_large(void) {
 
     CU_ASSERT_EQUAL(guac_mem_ckd_mul_or_die(SIZE_MAX), SIZE_MAX);
 
diff --git a/src/libguac/tests/mem/ckd_sub.c b/src/libguac/tests/mem/ckd_sub.c
index 4dfa01b..5fb8bb4 100644
--- a/src/libguac/tests/mem/ckd_sub.c
+++ b/src/libguac/tests/mem/ckd_sub.c
@@ -25,7 +25,7 @@
  * Test which verifies that guac_mem_ckd_sub() calculates results correctly for
  * all inputs involving at least one zero value.
  */
-void test_mem__ckd_sub_zero() {
+void test_mem__ckd_sub_zero(void) {
 
     size_t result = SIZE_MAX;
 
@@ -63,7 +63,7 @@
  * values for relatively small integer inputs, including inputs that cause
  * overflow beyond zero.
  */
-void test_mem__ckd_sub_small() {
+void test_mem__ckd_sub_small(void) {
 
     size_t result = SIZE_MAX;
 
@@ -88,7 +88,7 @@
  * relatively large integer inputs, including inputs that cause overflow beyond
  * zero.
  */
-void test_mem__ckd_sub_large() {
+void test_mem__ckd_sub_large(void) {
 
     size_t result = 0;
 
diff --git a/src/libguac/tests/mem/ckd_sub_or_die.c b/src/libguac/tests/mem/ckd_sub_or_die.c
index e29d6c1..26508ab 100644
--- a/src/libguac/tests/mem/ckd_sub_or_die.c
+++ b/src/libguac/tests/mem/ckd_sub_or_die.c
@@ -27,7 +27,7 @@
  * Test which verifies that guac_mem_ckd_sub_or_die() calculates results
  * correctly for all inputs involving at least one zero value.
  */
-void test_mem__ckd_sub_or_die_zero() {
+void test_mem__ckd_sub_or_die_zero(void) {
 
     CU_ASSERT_EQUAL(guac_mem_ckd_sub_or_die(0), 0);
     CU_ASSERT_EQUAL(guac_mem_ckd_sub_or_die(0, 0), 0);
@@ -46,7 +46,7 @@
  * expected values for relatively small integer inputs, including inputs that
  * cause overflow beyond zero.
  */
-void test_mem__ckd_sub_or_die_small() {
+void test_mem__ckd_sub_or_die_small(void) {
 
     CU_ASSERT_EQUAL(guac_mem_ckd_sub_or_die(123), 123);
     CU_ASSERT_EQUAL(guac_mem_ckd_sub_or_die(456, 123), 456 - 123);
@@ -62,7 +62,7 @@
  * relatively large integer inputs, including inputs that cause overflow beyond
  * zero.
  */
-void test_mem__ckd_sub_or_die_large() {
+void test_mem__ckd_sub_or_die_large(void) {
 
     CU_ASSERT_EQUAL(guac_mem_ckd_sub_or_die(SIZE_MAX), SIZE_MAX);
     CU_ASSERT_EQUAL(guac_mem_ckd_sub_or_die(SIZE_MAX, SIZE_MAX / 2), SIZE_MAX - (SIZE_MAX / 2));
diff --git a/src/libguac/tests/mem/free.c b/src/libguac/tests/mem/free.c
index 62470fb..de6c7b6 100644
--- a/src/libguac/tests/mem/free.c
+++ b/src/libguac/tests/mem/free.c
@@ -25,7 +25,7 @@
  * Test which verifies that guac_mem_free() sets the provided pointer to NULL after
  * freeing.
  */
-void test_mem__free_assigns_null() {
+void test_mem__free_assigns_null(void) {
     void* ptr = guac_mem_alloc(123);
     CU_ASSERT_PTR_NOT_NULL(ptr);
     guac_mem_free(ptr);
@@ -36,7 +36,7 @@
  * Test which verifies that guac_mem_free_const() can be used to free constant
  * pointers, but that those pointers are not set to NULL after freeing.
  */
-void test_mem__free_const() {
+void test_mem__free_const(void) {
     const void* ptr = guac_mem_alloc(123);
     CU_ASSERT_PTR_NOT_NULL(ptr);
     guac_mem_free_const(ptr);
@@ -47,7 +47,7 @@
  * Test which verifies that guac_mem_free() does nothing if provided a NULL
  * pointer.
  */
-void test_mem__free_null() {
+void test_mem__free_null(void) {
     void* ptr = NULL;
     guac_mem_free(ptr);
     CU_PASS("Nothing freed (segfault did not occur)");
@@ -57,7 +57,7 @@
  * Test which verifies that guac_mem_free_const() does nothing if provided a NULL
  * pointer.
  */
-void test_mem__free_null_const() {
+void test_mem__free_null_const(void) {
     const void* ptr = NULL;
     guac_mem_free_const(ptr);
     CU_PASS("Nothing freed (segfault did not occur)");
diff --git a/src/libguac/tests/mem/realloc.c b/src/libguac/tests/mem/realloc.c
index 91dbef5..a4aa539 100644
--- a/src/libguac/tests/mem/realloc.c
+++ b/src/libguac/tests/mem/realloc.c
@@ -26,7 +26,7 @@
  * involving at least one zero value (reallocation to zero bytes is not an
  * error but equivalent freeing the memory).
  */
-void test_mem__realloc_success_zero() {
+void test_mem__realloc_success_zero(void) {
 
     void* ptr;
 
@@ -72,7 +72,7 @@
  * Test which verifies that guac_mem_realloc() successfully allocates blocks of
  * memory for inputs that can reasonably be expected to succeed.
  */
-void test_mem__realloc_success() {
+void test_mem__realloc_success(void) {
 
     void* ptr;
 
@@ -100,7 +100,7 @@
  * Test which verifies that guac_mem_realloc() fails to allocate blocks of
  * memory that exceed the capacity of a size_t.
  */
-void test_mem__realloc_fail_large() {
+void test_mem__realloc_fail_large(void) {
 
     void* ptr;
 
diff --git a/src/libguac/tests/mem/realloc_or_die.c b/src/libguac/tests/mem/realloc_or_die.c
index 4a244af..7931329 100644
--- a/src/libguac/tests/mem/realloc_or_die.c
+++ b/src/libguac/tests/mem/realloc_or_die.c
@@ -28,7 +28,7 @@
  * inputs involving at least one zero value (reallocation to zero bytes is not
  * an error but equivalent freeing the memory).
  */
-void test_mem__realloc_or_die_success_zero() {
+void test_mem__realloc_or_die_success_zero(void) {
 
     void* ptr;
 
@@ -74,7 +74,7 @@
  * Test which verifies that guac_mem_realloc_or_die() successfully allocates
  * blocks of memory for inputs that can reasonably be expected to succeed.
  */
-void test_mem__realloc_or_die_success() {
+void test_mem__realloc_or_die_success(void) {
 
     void* ptr;
 
@@ -102,7 +102,7 @@
  * Test which verifies that guac_mem_realloc_or_die() fails to allocate blocks of
  * memory that exceed the capacity of a size_t.
  */
-void test_mem__realloc_or_die_fail_large() {
+void test_mem__realloc_or_die_fail_large(void) {
 
     void* ptr;
 
diff --git a/src/libguac/tests/mem/zalloc.c b/src/libguac/tests/mem/zalloc.c
index 933dca0..faf4ce5 100644
--- a/src/libguac/tests/mem/zalloc.c
+++ b/src/libguac/tests/mem/zalloc.c
@@ -25,7 +25,7 @@
  * Test which verifies that guac_mem_zalloc() returns NULL for all inputs involving
  * at least one zero value.
  */
-void test_mem__zalloc_fail_zero() {
+void test_mem__zalloc_fail_zero(void) {
 
     CU_ASSERT_PTR_NULL(guac_mem_zalloc(0));
     CU_ASSERT_PTR_NULL(guac_mem_zalloc(0, 0));
@@ -70,7 +70,7 @@
  * memory for inputs that can reasonably be expected to succeed, and that each
  * block is zeroed out.
  */
-void test_mem__zalloc_success() {
+void test_mem__zalloc_success(void) {
 
     void* ptr;
 
@@ -95,7 +95,7 @@
  * Test which verifies that guac_mem_zalloc() fails to allocate blocks of memory
  * that exceed the capacity of a size_t.
  */
-void test_mem__zalloc_fail_large() {
+void test_mem__zalloc_fail_large(void) {
     CU_ASSERT_PTR_NULL(guac_mem_zalloc(123, 456, SIZE_MAX));
     CU_ASSERT_PTR_NULL(guac_mem_zalloc(SIZE_MAX / 2, SIZE_MAX / 2));
 }
diff --git a/src/libguac/tests/parser/append.c b/src/libguac/tests/parser/append.c
index 88515c1..baed9d6 100644
--- a/src/libguac/tests/parser/append.c
+++ b/src/libguac/tests/parser/append.c
@@ -28,7 +28,7 @@
  * Test which verifies that guac_parser correctly parses Guacamole instructions
  * from arbitrary blocks of data passed to guac_parser_append().
  */
-void test_parser__append() {
+void test_parser__append(void) {
 
     /* Allocate parser */
     guac_parser* parser = guac_parser_alloc();
diff --git a/src/libguac/tests/parser/read.c b/src/libguac/tests/parser/read.c
index 062a2f7..5db3b5b 100644
--- a/src/libguac/tests/parser/read.c
+++ b/src/libguac/tests/parser/read.c
@@ -116,7 +116,7 @@
  * received over a guac_socket. A child process is forked to write a series of
  * instructions which are read and verified by the parent process.
  */
-void test_parser__read() {
+void test_parser__read(void) {
 
     int fd[2];
 
diff --git a/src/libguac/tests/pool/next_free.c b/src/libguac/tests/pool/next_free.c
index e8bd945..a2245b7 100644
--- a/src/libguac/tests/pool/next_free.c
+++ b/src/libguac/tests/pool/next_free.c
@@ -31,7 +31,7 @@
  * unique integers, never repeating a retrieved integer until that integer
  * is returned to the pool.
  */
-void test_pool__next_free() {
+void test_pool__next_free(void) {
 
     guac_pool* pool;
 
diff --git a/src/libguac/tests/protocol/base64_decode.c b/src/libguac/tests/protocol/base64_decode.c
index 60c8a03..6939a0a 100644
--- a/src/libguac/tests/protocol/base64_decode.c
+++ b/src/libguac/tests/protocol/base64_decode.c
@@ -24,7 +24,7 @@
  * Tests that libguac's in-place base64 decoding function properly decodes
  * valid base64 and fails for invalid base64.
  */
-void test_protocol__decode_base64() {
+void test_protocol__decode_base64(void) {
 
     /* Test strings */
     char test_HELLO[]     = "SEVMTE8=";
diff --git a/src/libguac/tests/protocol/guac_protocol_version.c b/src/libguac/tests/protocol/guac_protocol_version.c
index f9b2fdf..bff4bd1 100644
--- a/src/libguac/tests/protocol/guac_protocol_version.c
+++ b/src/libguac/tests/protocol/guac_protocol_version.c
@@ -25,7 +25,7 @@
  * Test which verifies that conversion of the guac_protocol_version enum to
  * string values succeeds and produces the expected results.
  */
-void test_guac_protocol__version_to_string() {
+void test_guac_protocol__version_to_string(void) {
     
     guac_protocol_version version_a = GUAC_PROTOCOL_VERSION_1_5_0;
     guac_protocol_version version_b = GUAC_PROTOCOL_VERSION_1_0_0;
@@ -43,7 +43,7 @@
  * guac_protocol_version enum values, and that versions that do not match
  * any version get the correct unknown value.
  */
-void test_guac_protocol__string_to_version() {
+void test_guac_protocol__string_to_version(void) {
     
     char* str_version_a = "VERSION_1_3_0";
     char* str_version_b = "VERSION_1_1_0";
@@ -61,7 +61,7 @@
  * Test which verifies that the comparisons between guac_protocol_version enum
  * values produces the expected results.
  */
-void test_gauc_protocol__version_comparison() {
+void test_gauc_protocol__version_comparison(void) {
     
     CU_ASSERT_TRUE(GUAC_PROTOCOL_VERSION_1_3_0 > GUAC_PROTOCOL_VERSION_1_0_0);
     CU_ASSERT_TRUE(GUAC_PROTOCOL_VERSION_UNKNOWN < GUAC_PROTOCOL_VERSION_1_1_0);
diff --git a/src/libguac/tests/rect/align.c b/src/libguac/tests/rect/align.c
index bed1972..1c440aa 100644
--- a/src/libguac/tests/rect/align.c
+++ b/src/libguac/tests/rect/align.c
@@ -24,7 +24,7 @@
  * Test which verifies guac_rect_align() properly shifts and resizes rectangles
  * to fit an NxN grid.
  */
-void test_rect__align() {
+void test_rect__align(void) {
 
     /* A cell size of 4 is 2^4 (16) */
     const int cell_size = 4;
diff --git a/src/libguac/tests/rect/constrain.c b/src/libguac/tests/rect/constrain.c
index 18ddc7a..021f765 100644
--- a/src/libguac/tests/rect/constrain.c
+++ b/src/libguac/tests/rect/constrain.c
@@ -24,7 +24,7 @@
  * Test which verifies that guac_rect_constrain() restricts a given rectangle
  * to arbitrary bounds.
  */
-void test_rect__constrain() {
+void test_rect__constrain(void) {
 
     guac_rect max;
     guac_rect rect;
diff --git a/src/libguac/tests/rect/extend.c b/src/libguac/tests/rect/extend.c
index 264ab3b..44b881b 100644
--- a/src/libguac/tests/rect/extend.c
+++ b/src/libguac/tests/rect/extend.c
@@ -24,7 +24,7 @@
  * Test which verifies that guac_rect_extend() expands the given rectangle as
  * necessary to contain at least the given bounds.
  */
-void test_rect__extend() {
+void test_rect__extend(void) {
 
     guac_rect max;
     guac_rect rect;
diff --git a/src/libguac/tests/rect/init.c b/src/libguac/tests/rect/init.c
index c91efec..8950f4a 100644
--- a/src/libguac/tests/rect/init.c
+++ b/src/libguac/tests/rect/init.c
@@ -23,7 +23,7 @@
 /**
  * Test which verifies rectangle initialization via guac_rect_init().
  */
-void test_rect__init() {
+void test_rect__init(void) {
 
     guac_rect max;
 
diff --git a/src/libguac/tests/rect/intersects.c b/src/libguac/tests/rect/intersects.c
index e6b005e..7599193 100644
--- a/src/libguac/tests/rect/intersects.c
+++ b/src/libguac/tests/rect/intersects.c
@@ -23,7 +23,7 @@
 /**
  * Test which verifies intersection testing via guac_rect_intersects().
  */
-void test_rect__intersects() {
+void test_rect__intersects(void) {
 
     int res;
 
diff --git a/src/libguac/tests/socket/fd_send_instruction.c b/src/libguac/tests/socket/fd_send_instruction.c
index abbf5cc..b5890f4 100644
--- a/src/libguac/tests/socket/fd_send_instruction.c
+++ b/src/libguac/tests/socket/fd_send_instruction.c
@@ -107,7 +107,7 @@
  * implements writing of instructions. A child process is forked to write a
  * series of instructions which are read and verified by the parent process.
  */
-void test_socket__fd_send_instruction() {
+void test_socket__fd_send_instruction(void) {
 
     int fd[2];
 
diff --git a/src/libguac/tests/socket/nested_send_instruction.c b/src/libguac/tests/socket/nested_send_instruction.c
index 14e876b..e8fb84c 100644
--- a/src/libguac/tests/socket/nested_send_instruction.c
+++ b/src/libguac/tests/socket/nested_send_instruction.c
@@ -120,7 +120,7 @@
  * implements writing of instructions. A child process is forked to write a
  * series of instructions which are read and verified by the parent process.
  */
-void test_socket__nested_send_instruction() {
+void test_socket__nested_send_instruction(void) {
 
     int fd[2];
 
diff --git a/src/libguac/tests/string/strdup.c b/src/libguac/tests/string/strdup.c
index 9641e09..7b4750c 100644
--- a/src/libguac/tests/string/strdup.c
+++ b/src/libguac/tests/string/strdup.c
@@ -37,7 +37,7 @@
 /**
  * Verify guac_strdup() behavior when the string is both NULL and not NULL.
  */
-void test_string__strdup() {
+void test_string__strdup(void) {
 
     /* Copy the strings. */
     char* dest_string = guac_strdup(source_string);
diff --git a/src/libguac/tests/string/strlcat.c b/src/libguac/tests/string/strlcat.c
index cf3dc33..3144e8b 100644
--- a/src/libguac/tests/string/strlcat.c
+++ b/src/libguac/tests/string/strlcat.c
@@ -29,7 +29,7 @@
  * resulting string. Each resulting string should contain the full result of
  * the concatenation, including null terminator.
  */
-void test_string__strlcat() {
+void test_string__strlcat(void) {
 
     char buffer[1024];
 
@@ -72,7 +72,7 @@
  * many characters as can fit should be appended to the string within the
  * buffer, and the buffer should be null-terminated.
  */
-void test_string__strlcat_truncate() {
+void test_string__strlcat_truncate(void) {
 
     char buffer[1024];
 
@@ -101,7 +101,7 @@
  * each call should be the size of the input string, while the buffer remains
  * untouched.
  */
-void test_string__strlcat_nospace() {
+void test_string__strlcat_nospace(void) {
 
     /* 0-byte buffer plus 1 guard byte (to test overrun) */
     char buffer[1] = { '\xFF' };
@@ -126,7 +126,7 @@
  * considered equal to the size of the buffer, however the resulting buffer
  * should not be null-terminated.
  */
-void test_string__strlcat_nonull() {
+void test_string__strlcat_nonull(void) {
 
     char expected[1024];
     memset(expected, 0xFF, sizeof(expected));
diff --git a/src/libguac/tests/string/strlcpy.c b/src/libguac/tests/string/strlcpy.c
index 1e8e01e..1c49f84 100644
--- a/src/libguac/tests/string/strlcpy.c
+++ b/src/libguac/tests/string/strlcpy.c
@@ -27,7 +27,7 @@
  * Verify guac_strlcpy() behavior when the string fits the buffer without
  * truncation.
  */
-void test_string__strlcpy() {
+void test_string__strlcpy(void) {
 
     char buffer[1024];
 
@@ -57,7 +57,7 @@
  * Verify guac_strlcpy() behavior when the string must be truncated to fit the
  * buffer.
  */
-void test_string__strlcpy_truncate() {
+void test_string__strlcpy_truncate(void) {
 
     char buffer[1024];
 
@@ -81,7 +81,7 @@
 /**
  * Verify guac_strlcpy() behavior with zero buffer sizes.
  */
-void test_string__strlcpy_nospace() {
+void test_string__strlcpy_nospace(void) {
 
     /* 0-byte buffer plus 1 guard byte (to test overrun) */
     char buffer[1] = { '\xFF' };
diff --git a/src/libguac/tests/string/strljoin.c b/src/libguac/tests/string/strljoin.c
index 3993288..c3e7ba5 100644
--- a/src/libguac/tests/string/strljoin.c
+++ b/src/libguac/tests/string/strljoin.c
@@ -50,7 +50,7 @@
  * resulting string. Each resulting string should contain the full result of
  * the join operation, including null terminator.
  */
-void test_string__strljoin() {
+void test_string__strljoin(void) {
 
     char buffer[1024];
 
@@ -88,7 +88,7 @@
  * characters as can fit should be appended to the string within the buffer,
  * and the buffer should be null-terminated.
  */
-void test_string__strljoin_truncate() {
+void test_string__strljoin_truncate(void) {
 
     char buffer[1024];
 
@@ -124,7 +124,7 @@
  * each call should be the size of the input string, while the buffer remains
  * untouched.
  */
-void test_string__strljoin_nospace() {
+void test_string__strljoin_nospace(void) {
 
     /* 0-byte buffer plus 1 guard byte (to test overrun) */
     char buffer[1] = { '\xFF' };
diff --git a/src/libguac/tests/string/strnstr.c b/src/libguac/tests/string/strnstr.c
index ffd02db..d2f2e47 100644
--- a/src/libguac/tests/string/strnstr.c
+++ b/src/libguac/tests/string/strnstr.c
@@ -26,7 +26,7 @@
 /**
  * Verify guac_strnstr() behaviors:
  */
-void test_string__strnstr() {
+void test_string__strnstr(void) {
     char haystack[8] = {'a', 'h', 'i', ' ', 't', 'u', 'n', 'a'};
     char* result;
 
diff --git a/src/libguac/tests/unicode/charsize.c b/src/libguac/tests/unicode/charsize.c
index e636155..b9dd892 100644
--- a/src/libguac/tests/unicode/charsize.c
+++ b/src/libguac/tests/unicode/charsize.c
@@ -24,7 +24,7 @@
  * Test which verifies that guac_utf8_charsize() correctly determines the
  * length of UTF-8 characters from the leading byte of that character.
  */
-void test_unicode__utf8_charsize() {
+void test_unicode__utf8_charsize(void) {
     CU_ASSERT_EQUAL(1, guac_utf8_charsize('g'));
     CU_ASSERT_EQUAL(2, guac_utf8_charsize('\xC4'));
     CU_ASSERT_EQUAL(3, guac_utf8_charsize('\xE7'));
diff --git a/src/libguac/tests/unicode/read.c b/src/libguac/tests/unicode/read.c
index 230a721..c021d79 100644
--- a/src/libguac/tests/unicode/read.c
+++ b/src/libguac/tests/unicode/read.c
@@ -23,7 +23,7 @@
 /**
  * Test which verifies that guac_utf8_read() properly parses UTF-8.
  */
-void test_unicode__utf8_read() {
+void test_unicode__utf8_read(void) {
 
     int codepoint;
 
diff --git a/src/libguac/tests/unicode/strlen.c b/src/libguac/tests/unicode/strlen.c
index 995a503..3ff129a 100644
--- a/src/libguac/tests/unicode/strlen.c
+++ b/src/libguac/tests/unicode/strlen.c
@@ -44,7 +44,7 @@
  * Test which verifies that guac_utf8_strlen() properly calculates the length
  * of UTF-8 strings.
  */
-void test_unicode__utf8_strlen() {
+void test_unicode__utf8_strlen(void) {
     CU_ASSERT_EQUAL(0, guac_utf8_strlen(""));
     CU_ASSERT_EQUAL(1, guac_utf8_strlen(UTF8_4b));
     CU_ASSERT_EQUAL(2, guac_utf8_strlen(UTF8_4b UTF8_1b));
diff --git a/src/libguac/tests/unicode/write.c b/src/libguac/tests/unicode/write.c
index 8480086..9bb88e6 100644
--- a/src/libguac/tests/unicode/write.c
+++ b/src/libguac/tests/unicode/write.c
@@ -24,7 +24,7 @@
  * Test which verifies that guac_utf8_write() properly encodes Unicode
  * codepoints as UTF-8.
  */
-void test_unicode__utf8_write() {
+void test_unicode__utf8_write(void) {
 
     char buffer[16];
 
diff --git a/src/libguac/timestamp.c b/src/libguac/timestamp.c
index 9020a6e..c42fa3d 100644
--- a/src/libguac/timestamp.c
+++ b/src/libguac/timestamp.c
@@ -27,7 +27,7 @@
 #include <time.h>
 #endif
 
-guac_timestamp guac_timestamp_current() {
+guac_timestamp guac_timestamp_current(void) {
 
 #ifdef HAVE_CLOCK_GETTIME
 
diff --git a/src/libguac/user.c b/src/libguac/user.c
index 753aca3..9432189 100644
--- a/src/libguac/user.c
+++ b/src/libguac/user.c
@@ -40,7 +40,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-guac_user* guac_user_alloc() {
+guac_user* guac_user_alloc(void) {
 
     guac_user* user = guac_mem_zalloc(sizeof(guac_user));
     int i;
diff --git a/src/protocols/kubernetes/tests/url/append.c b/src/protocols/kubernetes/tests/url/append.c
index 48e3601..a7fe598 100644
--- a/src/protocols/kubernetes/tests/url/append.c
+++ b/src/protocols/kubernetes/tests/url/append.c
@@ -27,7 +27,7 @@
  * Verifies that guac_kubernetes_append_endpoint_param() correctly appends
  * parameters to URLs that do not already have a query string.
  */
-void test_url__append_no_query() {
+void test_url__append_no_query(void) {
 
     char url[256] = "http://example.net";
 
@@ -40,7 +40,7 @@
  * Verifies that guac_kubernetes_append_endpoint_param() correctly appends
  * parameters to URLs that already have a query string.
  */
-void test_url__append_existing_query() {
+void test_url__append_existing_query(void) {
 
     char url[256] = "http://example.net?foo=test%20value";
 
@@ -53,7 +53,7 @@
  * Verifies that guac_kubernetes_append_endpoint_param() refuses to overflow
  * the bounds of the provided buffer.
  */
-void test_url__append_bounds() {
+void test_url__append_bounds(void) {
 
     char url[256];
 
diff --git a/src/protocols/kubernetes/tests/url/escape.c b/src/protocols/kubernetes/tests/url/escape.c
index d0e1f53..8bc6492 100644
--- a/src/protocols/kubernetes/tests/url/escape.c
+++ b/src/protocols/kubernetes/tests/url/escape.c
@@ -26,7 +26,7 @@
  * Verifies that guac_kubernetes_escape_url_component() correctly escapes
  * characters that would otherwise have special meaning within URLs.
  */
-void test_url__escape_special() {
+void test_url__escape_special(void) {
 
     char value[256];
 
@@ -39,7 +39,7 @@
  * Verifies that guac_kubernetes_escape_url_component() leaves strings
  * untouched if they contain no characters requiring escaping.
  */
-void test_url__escape_nospecial() {
+void test_url__escape_nospecial(void) {
 
     char value[256];
 
@@ -52,7 +52,7 @@
  * Verifies that guac_kubernetes_escape_url_component() refuses to overflow the
  * bounds of the provided buffer.
  */
-void test_url__escape_bounds() {
+void test_url__escape_bounds(void) {
 
     char value[256];
 
diff --git a/src/protocols/rdp/doc/svc-example/svc-example.c b/src/protocols/rdp/doc/svc-example/svc-example.c
index 681b3f9..4b8e248 100644
--- a/src/protocols/rdp/doc/svc-example/svc-example.c
+++ b/src/protocols/rdp/doc/svc-example/svc-example.c
@@ -28,7 +28,7 @@
  */
 #define SVC_NAME "EXAMPLE"
 
-int main() {
+int main(void) {
 
     ULONG bytes_read;
     ULONG bytes_written;
diff --git a/src/protocols/rdp/tests/fs/basename.c b/src/protocols/rdp/tests/fs/basename.c
index 9ac6097..5ab1898 100644
--- a/src/protocols/rdp/tests/fs/basename.c
+++ b/src/protocols/rdp/tests/fs/basename.c
@@ -26,7 +26,7 @@
  * Test which verifies basenames are correctly extracted from Windows-style
  * paths.
  */
-void test_fs__basename_windows() {
+void test_fs__basename_windows(void) {
     CU_ASSERT_STRING_EQUAL(guac_rdp_fs_basename("\\foo\\bar\\baz"), "baz")
     CU_ASSERT_STRING_EQUAL(guac_rdp_fs_basename("\\foo\\bar\\..\\baz\\"), "")
     CU_ASSERT_STRING_EQUAL(guac_rdp_fs_basename("bar\\..\\..\\baz\\a\\..\\b"), "b")
@@ -37,7 +37,7 @@
 /**
  * Test which verifies basenames are correctly extracted from UNIX-style paths.
  */
-void test_fs__basename_unix() {
+void test_fs__basename_unix(void) {
     CU_ASSERT_STRING_EQUAL(guac_rdp_fs_basename("/foo/bar/baz"), "baz")
     CU_ASSERT_STRING_EQUAL(guac_rdp_fs_basename("/foo/bar/../baz/"), "")
     CU_ASSERT_STRING_EQUAL(guac_rdp_fs_basename("bar/../../baz/a/../b"), "b")
@@ -49,7 +49,7 @@
  * Test which verifies basenames are correctly extracted from paths consisting
  * of mixed Windows and UNIX path separators.
  */
-void test_fs__basename_mixed() {
+void test_fs__basename_mixed(void) {
     CU_ASSERT_STRING_EQUAL(guac_rdp_fs_basename("\\foo/bar\\baz"), "baz")
     CU_ASSERT_STRING_EQUAL(guac_rdp_fs_basename("/foo\\bar/..\\baz/"), "")
     CU_ASSERT_STRING_EQUAL(guac_rdp_fs_basename("bar\\../../baz\\a\\..\\b"), "b")
diff --git a/src/protocols/rdp/tests/fs/normalize_path.c b/src/protocols/rdp/tests/fs/normalize_path.c
index 8640dab..0c29081 100644
--- a/src/protocols/rdp/tests/fs/normalize_path.c
+++ b/src/protocols/rdp/tests/fs/normalize_path.c
@@ -28,7 +28,7 @@
  * Test which verifies absolute Windows-style paths are correctly normalized to
  * absolute paths with Windows separators and no relative components.
  */
-void test_fs__normalize_absolute_windows() {
+void test_fs__normalize_absolute_windows(void) {
 
     char normalized[GUAC_RDP_FS_MAX_PATH];
 
@@ -56,7 +56,7 @@
  * Test which verifies absolute UNIX-style paths are correctly normalized to
  * absolute paths with Windows separators and no relative components.
  */
-void test_fs__normalize_absolute_unix() {
+void test_fs__normalize_absolute_unix(void) {
 
     char normalized[GUAC_RDP_FS_MAX_PATH];
 
@@ -85,7 +85,7 @@
  * separators are correctly normalized to absolute paths with Windows
  * separators and no relative components.
  */
-void test_fs__normalize_absolute_mixed() {
+void test_fs__normalize_absolute_mixed(void) {
 
     char normalized[GUAC_RDP_FS_MAX_PATH];
 
@@ -109,7 +109,7 @@
 /**
  * Test which verifies relative Windows-style paths are always rejected.
  */
-void test_fs__normalize_relative_windows() {
+void test_fs__normalize_relative_windows(void) {
 
     char normalized[GUAC_RDP_FS_MAX_PATH];
 
@@ -128,7 +128,7 @@
 /**
  * Test which verifies relative UNIX-style paths are always rejected.
  */
-void test_fs__normalize_relative_unix() {
+void test_fs__normalize_relative_unix(void) {
 
     char normalized[GUAC_RDP_FS_MAX_PATH];
 
@@ -148,7 +148,7 @@
  * Test which verifies relative paths consisting of mixed Windows and UNIX path
  * separators are always rejected.
  */
-void test_fs__normalize_relative_mixed() {
+void test_fs__normalize_relative_mixed(void) {
 
     char normalized[GUAC_RDP_FS_MAX_PATH];
 
@@ -208,7 +208,7 @@
  * Test which verifies that paths exceeding the maximum path length are
  * rejected.
  */
-void test_fs__normalize_long() {
+void test_fs__normalize_long(void) {
 
     char* input;
     char normalized[GUAC_RDP_FS_MAX_PATH];
@@ -234,7 +234,7 @@
  * Test which verifies that paths exceeding the maximum path depth are
  * rejected.
  */
-void test_fs__normalize_deep() {
+void test_fs__normalize_deep(void) {
 
     char* input;
     char normalized[GUAC_RDP_FS_MAX_PATH];
diff --git a/src/terminal/tests/selection-point/enclose-text.c b/src/terminal/tests/selection-point/enclose-text.c
index 637f704..ed6007b 100644
--- a/src/terminal/tests/selection-point/enclose-text.c
+++ b/src/terminal/tests/selection-point/enclose-text.c
@@ -26,7 +26,7 @@
  * Verifies that guac_terminal_selection_points_enclose_text() correctly 
  * calculates if the range contains a full character.
  */
-void test_selection_point__enclose_text() {
+void test_selection_point__enclose_text(void) {
 
     guac_terminal_selection_point a = {
         .column = 1,
@@ -70,7 +70,7 @@
  * Verifies that guac_terminal_selection_points_enclose_text() correctly 
  * calculates if the range contains a full character with wide characters.
  */
-void test_selection_point__enclose_wide_text() {
+void test_selection_point__enclose_wide_text(void) {
 
     guac_terminal_selection_point a = {
         .column = 1,
diff --git a/src/terminal/tests/selection-point/point-after.c b/src/terminal/tests/selection-point/point-after.c
index 470730e..3661732 100644
--- a/src/terminal/tests/selection-point/point-after.c
+++ b/src/terminal/tests/selection-point/point-after.c
@@ -26,7 +26,7 @@
  * Verifies that guac_terminal_selection_point_is_after() correctly
  * determins the order of two points.
  */
-void test_selection_point__is_point_after() {
+void test_selection_point__is_point_after(void) {
 
     guac_terminal_selection_point a = {
         .column = 1,
diff --git a/src/terminal/tests/selection-point/rounding.c b/src/terminal/tests/selection-point/rounding.c
index c4389e7..f67eaa8 100644
--- a/src/terminal/tests/selection-point/rounding.c
+++ b/src/terminal/tests/selection-point/rounding.c
@@ -27,7 +27,7 @@
  * guac_terminal_selection_point_round_up() both correctly
  * calculate normalized column values for a point.
  */
-void test_selection_point__rounding() {
+void test_selection_point__rounding(void) {
 
     guac_terminal_selection_point a = {
         .column = 1,
@@ -51,7 +51,7 @@
  * guac_terminal_selection_point_round_up() both correctly
  * calculate normalized column values for points with wide characters.
  */
-void test_selection_point__rounding_wide() {
+void test_selection_point__rounding_wide(void) {
 
     guac_terminal_selection_point a = {
         .column = 1,