diff --git a/src/sync-core.h b/src/sync-core.h
index a0eb547..423afcc 100644
--- a/src/sync-core.h
+++ b/src/sync-core.h
@@ -86,7 +86,7 @@
   deregister(const Ccnx::Name &name);
 
   void
-  recover(const HashPtr &hash);
+  recover(HashPtr hash);
 
 private:
   void