diff --git a/src/msw/gsocket.c b/src/msw/gsocket.c
index 55b8679987..fc5f87c83d 100644
--- a/src/msw/gsocket.c
+++ b/src/msw/gsocket.c
@@ -60,6 +60,11 @@
 
 #include <winsock.h>
 
+/* don't use C++ TRUE/FALSE definition which we get from wx/defs.h */
+#undef TRUE
+#undef FALSE
+#define TRUE 1
+#define FALSE 0
 
 /* if we use configure for MSW SOCKLEN_T will be already defined */
 #ifndef SOCKLEN_T