diff --git a/include/boost/iterator/iterator_concepts.hpp b/include/boost/iterator/iterator_concepts.hpp
index 361fa8b..016c459 100644
--- a/include/boost/iterator/iterator_concepts.hpp
+++ b/include/boost/iterator/iterator_concepts.hpp
@@ -265,7 +265,7 @@ namespace boost_concepts {
       }
     };
 
-  };
+  } // namespace detail
 
   template <typename Iterator,
             typename ConstIterator>