diff --git a/lemon/concepts/path.h b/lemon/concepts/path.h
--- a/lemon/concepts/path.h
+++ b/lemon/concepts/path.h
@@ -21,8 +21,8 @@
 ///\brief Classes for representing paths in digraphs.
 ///
 
-#ifndef LEMON_CONCEPT_PATH_H
-#define LEMON_CONCEPT_PATH_H
+#ifndef LEMON_CONCEPTS_PATH_H
+#define LEMON_CONCEPTS_PATH_H
 
 #include <lemon/core.h>
 #include <lemon/concept_check.h>
@@ -305,4 +305,4 @@
 
 } // namespace lemon
 
-#endif // LEMON_CONCEPT_PATH_H
+#endif