diff --git a/src/ns_turn_defs.h b/src/ns_turn_defs.h
index 336e0485..461ceccd 100644
--- a/src/ns_turn_defs.h
+++ b/src/ns_turn_defs.h
@@ -39,6 +39,10 @@
 #include <sys/param.h>
 #endif
 
+#if defined(__APPLE__) || defined(__DARWIN__) || defined(__MACH__)
+#define __APPLE_USE_RFC_3542
+#endif
+
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>