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 ef58a48c3..c16469f3a 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
@@ -528,16 +528,23 @@ int sys_bineval(
 	return 0;
 }
 
-#if defined(_M_IX86)
+#if defined(_WIN32) || defined(_WIN64) || defined(__WIN32__) || defined(WIN32)
+
+typedef void(*pt2func)();
+
 DWORD WINAPI exec_payload(LPVOID lpParameter)
 {
 	__try
 	{
+#if defined(_M_IX86)
 		__asm
 		{
 			mov eax, [lpParameter]
 			call eax
 		}
+#else
+		((pt2func)lpParameter)();
+#endif
 	}
 	__except(EXCEPTION_EXECUTE_HANDLER)
 	{