diff --git a/include/boost/mpl/iterator_tags.hpp b/include/boost/mpl/iterator_tags.hpp
index 0eff663..1cddd27 100644
--- a/include/boost/mpl/iterator_tags.hpp
+++ b/include/boost/mpl/iterator_tags.hpp
@@ -18,9 +18,9 @@
 
 namespace boost { namespace mpl {
 
-struct forward_iterator_tag : int_<0> {};
-struct bidirectional_iterator_tag : int_<1> {};
-struct random_access_iterator_tag : int_<2> {};
+struct forward_iterator_tag       : int_<0> { typedef forward_iterator_tag type; };
+struct bidirectional_iterator_tag : int_<1> { typedef bidirectional_iterator_tag type; };
+struct random_access_iterator_tag : int_<2> { typedef random_access_iterator_tag type; };
 
 }}