diff --git a/src/core/endian_type.hpp b/src/core/endian_type.hpp
--- a/src/core/endian_type.hpp
+++ b/src/core/endian_type.hpp
@@ -27,14 +27,21 @@
 
 /* Windows has always LITTLE_ENDIAN */
 #if defined(WIN32) || defined(__OS2__) || defined(WIN64)
-	#define TTD_ENDIAN TTD_LITTLE_ENDIAN
+#	define TTD_ENDIAN TTD_LITTLE_ENDIAN
+#elif defined(OSX)
+#	include <sys/types.h>
+#	if __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN
+#		define TTD_ENDIAN TTD_LITTLE_ENDIAN
+#	else
+#		define TTD_ENDIAN TTD_BIG_ENDIAN
+#	endif
 #elif !defined(TESTING)
-	#include <sys/param.h>
-	#if __BYTE_ORDER == __LITTLE_ENDIAN
-		#define TTD_ENDIAN TTD_LITTLE_ENDIAN
-	#else
-		#define TTD_ENDIAN TTD_BIG_ENDIAN
-	#endif
+#	include <sys/param.h>
+#	if __BYTE_ORDER == __LITTLE_ENDIAN
+#		define TTD_ENDIAN TTD_LITTLE_ENDIAN
+#	else
+#		define TTD_ENDIAN TTD_BIG_ENDIAN
+#	endif
 #endif /* WIN32 || __OS2__ || WIN64 */
 
 #endif /* ENDIAN_TYPE_HPP */