diff --git a/Source/MFCDialog/StdAfx.h b/Source/MFCDialog/StdAfx.h
index b939926da..ff1a2d301 100644
--- a/Source/MFCDialog/StdAfx.h
+++ b/Source/MFCDialog/StdAfx.h
@@ -21,7 +21,11 @@
 
 #if !defined(AFX_STDAFX_H__AC17A6F8_4634_11D4_8F21_00A0CC33FCD3__INCLUDED_)
 #define AFX_STDAFX_H__AC17A6F8_4634_11D4_8F21_00A0CC33FCD3__INCLUDED_
+#if _MSC_VER < 1600
 #define _WIN32_WINNT 0x0400
+#else
+#define _WIN32_WINNT 0x0500
+#endif
 #define _WIN32_IE 0x0400
 
 #if _MSC_VER > 1000