--- a/src/core/model/hash.h	Tue Nov 13 16:35:21 2012 -0800
+++ b/src/core/model/hash.h	Tue Nov 13 16:35:51 2012 -0800
@@ -109,7 +109,7 @@
    *
    * \return this
    */
-  Hash * clear (void);
+  Hash & clear (void);
   
 private:
   Ptr<HashImplementation> m_impl;    /** Hash implementation */