Support Windows compilation
diff --git a/c_src/snappy/snappy-stubs-internal.h b/c_src/snappy/snappy-stubs-internal.h
index ddca1a8..a07b6df 100644
--- a/c_src/snappy/snappy-stubs-internal.h
+++ b/c_src/snappy/snappy-stubs-internal.h
@@ -45,6 +45,11 @@
 #include <sys/mman.h>
 #endif
 
+#ifdef _MSC_VER
+#include <BaseTsd.h>
+typedef SSIZE_T ssize_t;
+#endif
+
 #include "snappy-stubs-public.h"
 
 #if defined(__x86_64__)