diff --git a/rotate.c b/rotate.c
index f93c1b5d..0a7fd314 100644
--- a/rotate.c
+++ b/rotate.c
@@ -31,7 +31,10 @@
  */
 #include "rotate.h"
 #include <stdint.h>
-#ifdef BSD
+#if defined(__APPLE__)
+#include <libkern/OSByteOrder.h>
+#define bswap_32(x) OSSwapInt32(x)
+#elif defined(BSD)
 #include <sys/endian.h>
 #define bswap_32(x) bswap32(x)
 #else