diff --git a/model/ccnx-face.h b/model/ccnx-face.h
index 1119ba8..4a0cdf9 100644
--- a/model/ccnx-face.h
+++ b/model/ccnx-face.h
@@ -225,7 +225,7 @@
    *
    * \param p smart pointer to a packet to send
    */
-  virtual void
+  virtual bool
   SendImpl (Ptr<Packet> p) = 0;  
 
 private: