diff -r 8668e1b5dafb -r c786cd201266 lemon/concepts/heap.h
--- a/lemon/concepts/heap.h	Sun Feb 22 09:52:44 2009 +0000
+++ b/lemon/concepts/heap.h	Mon Feb 23 11:58:39 2009 +0100
@@ -24,6 +24,7 @@
 #define LEMON_CONCEPT_HEAP_H
 
 #include <lemon/core.h>
+#include <lemon/concept_check.h>
 
 namespace lemon {