diff --git a/src/main/cpp/mutex.cpp b/src/main/cpp/mutex.cpp
index c50a562..3ee29dd 100644
--- a/src/main/cpp/mutex.cpp
+++ b/src/main/cpp/mutex.cpp
@@ -16,10 +16,10 @@
  */
 
 #include <log4cxx/logstring.h>
-#include <log4cxx/helpers/mutex.h>
 #include <log4cxx/helpers/exception.h>
-#include <apr_thread_mutex.h>
+#include <log4cxx/helpers/mutex.h>
 #include <log4cxx/helpers/pool.h>
+#include <apr_thread_mutex.h>
 #include <assert.h>
 #if !defined(LOG4CXX)
 #define LOG4CXX 1