diff --git a/apps/ndn-consumer.h b/apps/ndn-consumer.h
index e9f9a74..7fd8877 100644
--- a/apps/ndn-consumer.h
+++ b/apps/ndn-consumer.h
@@ -178,6 +178,9 @@
   SeqTimeoutsContainer m_seqLifetimes;
   
   TracedCallback<Ptr<Node>, Ptr<Node>, uint32_t, uint32_t > m_pathWeightsTrace;
+  TracedCallback<Ptr<App> /* app */, uint32_t /* seqno */, Time /* delay */> m_lastRetransmittedInterestDataDelay;
+  TracedCallback<Ptr<App> /* app */, uint32_t /* seqno */, Time /* delay */> m_firstInterestDataDelay;
+  
 /// @endcond
 };