diff --git a/src/os/inc/osDarwin.h b/src/os/inc/osDarwin.h
index 13f93456f25999277b55da96628fcce482a643f6..14b8ccf53c5ca2c857a47c007a8ba5933e06ddc6 100644
--- a/src/os/inc/osDarwin.h
+++ b/src/os/inc/osDarwin.h
@@ -91,7 +91,12 @@ extern "C" {
 typedef int(*__compar_fn_t)(const void *, const void *);
 
 // for send function in tsocket.c
-// #define MSG_NOSIGNAL             0
+#if defined(MSG_NOSIGNAL)
+#undef MSG_NOSIGNAL
+#endif
+
+#define MSG_NOSIGNAL             0
+
 #define SO_NO_CHECK              0x1234
 #define SOL_TCP                  0x1234
 #define TCP_KEEPIDLE             0x1234