diff --git a/lemon/bits/default_map.h b/lemon/bits/default_map.h
--- a/lemon/bits/default_map.h
+++ b/lemon/bits/default_map.h
@@ -96,7 +96,7 @@
   };
 
 
-#if defined __GNUC__ && !defined __STRICT_ANSI__
+#if defined HAVE_LONG_LONG
 
   // long long
   template <typename _Graph, typename _Item>