diff --git a/include/cross.h b/include/cross.h
index 5699cd40..6692d691 100644
--- a/include/cross.h
+++ b/include/cross.h
@@ -76,10 +76,10 @@ public:
 	static bool IsPathAbsolute(std::string const& in);
 };
 
-
 #if defined (WIN32)
-
-#define WIN32_LEAN_AND_MEAN        // Exclude rarely-used stuff from 
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
 #include <windows.h>
 
 typedef struct dir_struct {