--- a/src/node/queue.cc	Tue Aug 28 14:32:44 2007 +0200
+++ b/src/node/queue.cc	Tue Aug 28 14:33:53 2007 +0200
@@ -100,7 +100,7 @@
 }
 
 Ptr<TraceResolver>
-Queue::GetTraceResolver (void)
+Queue::GetTraceResolver (void) const
 {
   Ptr<CompositeTraceResolver> resolver = Create<CompositeTraceResolver> ();
   resolver->AddSource ("enqueue",