--- a/src/devices/point-to-point/point-to-point-net-device.cc	Wed Nov 21 13:36:47 2007 +0100
+++ b/src/devices/point-to-point/point-to-point-net-device.cc	Thu Nov 29 00:59:00 2007 +0100
@@ -253,7 +253,7 @@
                        PointToPointTraceType (PointToPointTraceType::RX));
   resolver->AddSource ("drop",
                        TraceDoc ("drop MAC packet",
-                                 "const Packet &", "packet dropped"),
+                                 "Ptr<const Packet>", "packet dropped"),
                        m_dropTrace,
                        PointToPointTraceType (PointToPointTraceType::DROP));
   resolver->SetParentResolver (NetDevice::GetTraceResolver ());