diff --git a/Roman/stdafx.h b/Roman/stdafx.h
index b9ea3e4..b1f0b22 100644
--- a/Roman/stdafx.h
+++ b/Roman/stdafx.h
@@ -5,7 +5,7 @@
 
 #pragma once
 
-#ifdef WIN32
+#ifdef _WIN32
     #include "targetver.h"
     #include <stdio.h>
     #include <tchar.h>