Index: iterator_concepts.h
===================================================================
--- iterator_concepts.h	(revision 524)
+++ iterator_concepts.h	(working copy)
@@ -172,7 +172,7 @@
 
   _GLIBCXX_LATE_CHECK
   template<BasicOutputIterator X, typename Value>
-  requires Assignable<BasicOutputIterator<X>::value_type, Value>
+  requires Assignable<BasicOutputIterator<X>::reference, Value>
   concept_map OutputIterator<X, Value>
   {
     typedef Value                                   value_type;