diff --git a/include/boost/iterator/iterator_categories.hpp b/include/boost/iterator/iterator_categories.hpp
index 7b4f9ae..0af3714 100644
--- a/include/boost/iterator/iterator_categories.hpp
+++ b/include/boost/iterator/iterator_categories.hpp
@@ -27,6 +27,9 @@ namespace boost {
 //
 // Traversal Categories
 //
+
+struct no_traversal_tag {};
+
 struct incrementable_traversal_tag {};
   
 struct single_pass_traversal_tag