--- a/src/node/udp.cc	Sun Mar 18 19:31:32 2007 +0100
+++ b/src/node/udp.cc	Sun Mar 18 14:06:51 2007 -0700
@@ -21,6 +21,8 @@
 
 #include "ns3/assert.h"
 #include "ns3/packet.h"
+#include "ns3/empty-trace-resolver.h"
+
 #include "udp.h"
 #include "udp-header.h"
 #include "ipv4-end-point-demux.h"
@@ -46,6 +48,12 @@
   delete m_endPoints;
 }
 
+TraceResolver *
+Udp::CreateTraceResolver (TraceContext const &context)
+{
+  return new EmptyTraceResolver (context);
+}
+
 UdpEndPoint *
 Udp::Allocate (void)
 {