diff --git a/lemon/concepts/heap.h b/lemon/concepts/heap.h
--- a/lemon/concepts/heap.h
+++ b/lemon/concepts/heap.h
@@ -20,8 +20,8 @@
 ///\file
 ///\brief The concept of heaps.
 
-#ifndef LEMON_CONCEPT_HEAP_H
-#define LEMON_CONCEPT_HEAP_H
+#ifndef LEMON_CONCEPTS_HEAP_H
+#define LEMON_CONCEPTS_HEAP_H
 
 #include <lemon/core.h>
 #include <lemon/concept_check.h>
@@ -243,4 +243,4 @@
     /// @}
   } // namespace lemon
 }
-#endif // LEMON_CONCEPT_PATH_H
+#endif