--- a/src/node/net-device.cc	Thu May 10 18:33:52 2007 +0200
+++ b/src/node/net-device.cc	Thu May 10 20:19:26 2007 +0200
@@ -183,7 +183,7 @@
   return DoCreateTraceResolver (context);
 }
 
-Channel *
+Ptr<Channel>
 NetDevice::GetChannel (void) const
 {
   return DoGetChannel ();
@@ -236,7 +236,7 @@
 }
 
 void 
-NetDevice::SetReceiveCallback (Callback<bool,NetDevice *,const Packet &,uint16_t> cb)
+NetDevice::SetReceiveCallback (Callback<bool,Ptr<NetDevice>,const Packet &,uint16_t> cb)
 {
   m_receiveCallback = cb;
 }