diff --git a/model/ccnx-app-face.h b/model/ccnx-app-face.h
index 06d9a3f..967ee13 100644
--- a/model/ccnx-app-face.h
+++ b/model/ccnx-app-face.h
@@ -61,7 +61,7 @@
   RegisterProtocolHandler (ProtocolHandler handler);
 
 protected:
-  virtual void
+  virtual bool
   SendImpl (Ptr<Packet> p);
 
 public: