--- cvsroot/libcoro/coro.c	2012/12/05 13:01:18	1.64
+++ cvsroot/libcoro/coro.c	2012/12/05 13:10:21	1.65
@@ -508,6 +508,7 @@
 #elif CORO_FIBER
 
 #define WIN32_LEAN_AND_MEAN
+#define _WIN32_WINNT 0x0400
 #include <windows.h>
 
 VOID CALLBACK