diff --git a/utils/tracers/ndn-app-delay-tracer.h b/utils/tracers/ndn-app-delay-tracer.h
index ac586b2..c7a433c 100644
--- a/utils/tracers/ndn-app-delay-tracer.h
+++ b/utils/tracers/ndn-app-delay-tracer.h
@@ -91,10 +91,10 @@
   Connect ();
 
   void 
-  LastRetransmittedInterestDataDelay (Ptr<App> app, uint32_t seqno, Time delay);
+  LastRetransmittedInterestDataDelay (Ptr<App> app, uint32_t seqno, Time delay, int32_t hopCount);
   
   void 
-  FirstInterestDataDelay (Ptr<App> app, uint32_t seqno, Time delay, uint32_t rextCount);
+  FirstInterestDataDelay (Ptr<App> app, uint32_t seqno, Time delay, uint32_t rextCount, int32_t hopCount);
   
 private:
   std::string m_node;