diff --git a/src/EterLib/StdAfx.h b/src/EterLib/StdAfx.h
index b9698fb..485e790 100644
--- a/src/EterLib/StdAfx.h
+++ b/src/EterLib/StdAfx.h
@@ -1,6 +1,8 @@
 #pragma once
 
-#define WIN32_LEAN_AND_MEAN	
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif	
 #ifndef _CRT_SECURE_NO_WARNINGS
 #define _CRT_SECURE_NO_WARNINGS
 #endif