diff --git a/include/ac/socket.h b/include/ac/socket.h
index 5d739920c6..cb001e5702 100644
--- a/include/ac/socket.h
+++ b/include/ac/socket.h
@@ -98,6 +98,9 @@
 #		define tcp_close( s )		closesocket( s )
 #	endif
 
+#undef EWOULDBLOCK
+#undef EINPROGRESS
+#undef ETIMEDOUT
 #define EWOULDBLOCK WSAEWOULDBLOCK
 #define ENOTCONN WSAENOTCONN
 #define EINPROGRESS WSAEINPROGRESS