diff --git a/freeglut/freeglut/include/GL/freeglut_std.h b/freeglut/freeglut/include/GL/freeglut_std.h
index 0545e64..f799233 100644
--- a/freeglut/freeglut/include/GL/freeglut_std.h
+++ b/freeglut/freeglut/include/GL/freeglut_std.h
@@ -54,7 +54,9 @@
 #       endif
 #   endif
 
-#   define WIN32_LEAN_AND_MEAN
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN 1
+#  endif
 #   define NOMINMAX
 #   include <Windows.h>