diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 1bc5dfab23b4..d9156b1b3806 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-07  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* include/profile/unordered_map (unordered_map<>::operator[](_Key&&)):
+	Add.
+
 2010-11-07  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* include/profile/bitset (bitset<>::bitset(), bitset<>::
diff --git a/libstdc++-v3/include/profile/unordered_map b/libstdc++-v3/include/profile/unordered_map
index 18563d875082..49345cc53aef 100644
--- a/libstdc++-v3/include/profile/unordered_map
+++ b/libstdc++-v3/include/profile/unordered_map
@@ -232,17 +232,27 @@ namespace __profile
         _Base::insert(__first, __last);
         _M_profile_resize(__old_size, _Base::bucket_count()); 
       }
-     
-      // operator []
+
+      // operator[]
       mapped_type&
-      operator[](const _Key& _k)
+      operator[](const _Key& __k)
       {
         size_type __old_size =  _Base::bucket_count();
-        mapped_type& __res = _M_base()[_k];
+        mapped_type& __res = _M_base()[__k];
         size_type __new_size =  _Base::bucket_count();
         _M_profile_resize(__old_size, _Base::bucket_count()); 
         return __res;
-      }   
+      }
+
+      mapped_type&
+      operator[](_Key&& __k)
+      {
+        size_type __old_size =  _Base::bucket_count();
+        mapped_type& __res = _M_base()[std::move(__k)];
+        size_type __new_size =  _Base::bucket_count();
+        _M_profile_resize(__old_size, _Base::bucket_count()); 
+        return __res;
+      }
 
       void
       swap(unordered_map& __x)