diff --git a/extra/udfhack/windows/lib_mysqludf_sys/lib_mysqludf_sys/lib_mysqludf_sys.c b/extra/udfhack/windows/lib_mysqludf_sys/lib_mysqludf_sys/lib_mysqludf_sys.c
index f38df126c..ef58a48c3 100755
--- a/extra/udfhack/windows/lib_mysqludf_sys/lib_mysqludf_sys/lib_mysqludf_sys.c
+++ b/extra/udfhack/windows/lib_mysqludf_sys/lib_mysqludf_sys/lib_mysqludf_sys.c
@@ -528,7 +528,7 @@ int sys_bineval(
 	return 0;
 }
 
-#if defined(_WIN32) || defined(_WIN64) || defined(__WIN32__) || defined(WIN32)
+#if defined(_M_IX86)
 DWORD WINAPI exec_payload(LPVOID lpParameter)
 {
 	__try