--- a/src/node/packet-socket-factory.cc	Thu Jan 03 11:37:23 2008 +0100
+++ b/src/node/packet-socket-factory.cc	Thu Jan 03 11:39:45 2008 +0100
@@ -24,6 +24,8 @@
 
 namespace ns3 {
 
+NS_OBJECT_ENSURE_REGISTERED (PacketSocketFactory);
+
 InterfaceId 
 PacketSocketFactory::iid (void)
 {