diff --git a/gcc/ada/s-oscons-tmplt.c b/gcc/ada/s-oscons-tmplt.c
index 044e203cdb6..f373c39b9c2 100644
--- a/gcc/ada/s-oscons-tmplt.c
+++ b/gcc/ada/s-oscons-tmplt.c
@@ -1463,14 +1463,8 @@ CND(MSG_PEEK, "Peek at incoming data")
 CND(MSG_EOR, "Send end of record")
 
 #ifndef MSG_WAITALL
-#ifdef __MINWGW32__
-/* The value of MSG_WAITALL is 8.  Nevertheless winsock.h doesn't
-   define it, but it is still usable as we link to winsock2 API.  */
-# define MSG_WAITALL (1 << 3)
-#else
 # define MSG_WAITALL -1
 #endif
-#endif
 CND(MSG_WAITALL, "Wait for full reception")
 
 #ifndef MSG_NOSIGNAL