diff --git a/src/xpdev/genwrap.c b/src/xpdev/genwrap.c
index 08b393a1585788be3da784de9db78ccb787e22e1..0937e62c35c75f4ae42bbe3d8cb7e99581dbaf90 100644
--- a/src/xpdev/genwrap.c
+++ b/src/xpdev/genwrap.c
@@ -1155,7 +1155,7 @@ int64_t xp_fast_timer64(void)
 	else
 		ret = -1;
 #elif defined(_WIN32)
-#if _WIN32_WINNT < _WIN32_WINNT_VISTA
+#if WINVER < 0x0600
 	ret=GetTickCount() / 1000;
 #else
 	ret=GetTickCount64() / 1000;