diff --git a/gio/gnetworkingprivate.h b/gio/gnetworkingprivate.h
index 8af75aac2..23240cf79 100644
--- a/gio/gnetworkingprivate.h
+++ b/gio/gnetworkingprivate.h
@@ -23,7 +23,7 @@
 
 #ifdef G_OS_WIN32
 
-#define WINVER 0x0501 // FIXME?
+#define _WIN32_WINNT 0x0500
 #include <winsock2.h>
 #undef interface
 #include <ws2tcpip.h>