--- detail/map_iterator.hpp	(revision 81723)
+++ detail/map_iterator.hpp	(working copy)
@@ -49,7 +49,7 @@
             : first(rp->first), second(rp->second)
             { }
             
-            const ref_pair* const operator->() const
+            const ref_pair* operator->() const
             {
                 return this;
             }