diff --git a/apps/ndn-consumer-window.h b/apps/ndn-consumer-window.h
index df79fb3..2057123 100644
--- a/apps/ndn-consumer-window.h
+++ b/apps/ndn-consumer-window.h
@@ -59,6 +59,9 @@
   virtual void
   OnTimeout (uint32_t sequenceNumber);
 
+  virtual void
+  WillSendOutInterest (uint32_t sequenceNumber);
+
 protected:
   /**
    * \brief Constructs the Interest packet and sends it using a callback to the underlying NDN protocol