--- a/src/internet/helper/ipv4-global-routing-helper.h	Sun Nov 24 23:48:49 2013 +0100
+++ b/src/internet/helper/ipv4-global-routing-helper.h	Wed Nov 20 20:15:02 2013 +0100
@@ -88,8 +88,9 @@
    * \internal
    * \brief Assignment operator declared private and not implemented to disallow
    * assignment and prevent the compiler from happily inserting its own.
+   * \return
    */
-  Ipv4GlobalRoutingHelper &operator = (const Ipv4GlobalRoutingHelper &o);
+  Ipv4GlobalRoutingHelper &operator = (const Ipv4GlobalRoutingHelper &);
 };
 
 } // namespace ns3