diff --git a/apps/ccnx-consumer.h b/apps/ccnx-consumer.h
index e53ff89..9f2ae53 100644
--- a/apps/ccnx-consumer.h
+++ b/apps/ccnx-consumer.h
@@ -62,11 +62,11 @@
   // OnInterest (const Ptr<const CcnxInterestHeader> &interest);
 
   virtual void
-  OnNack (const Ptr<const CcnxInterestHeader> &interest);
+  OnNack (const Ptr<const CcnxInterestHeader> &interest, Ptr<Packet> packet);
 
   virtual void
   OnContentObject (const Ptr<const CcnxContentObjectHeader> &contentObject,
-                   const Ptr<const Packet> &payload);
+                   Ptr<Packet> payload);
 
   virtual void
   OnTimeout (uint32_t sequenceNumber);