--- a/src/node/drop-tail-queue.cc	Wed Nov 21 09:08:32 2007 +0100
+++ b/src/node/drop-tail-queue.cc	Thu Nov 15 11:41:42 2007 +0000
@@ -95,7 +95,7 @@
 }
 
 bool
-DropTailQueue::DoPeek (Packet& p)
+DropTailQueue::DoPeek (Packet& p) const
 {
   NS_LOG_FUNCTION;
   NS_LOG_PARAMS (this << &p);