--- a/src/internet-node/ipv4-l3-protocol.cc	Thu Jan 03 11:37:23 2008 +0100
+++ b/src/internet-node/ipv4-l3-protocol.cc	Thu Jan 03 11:39:45 2008 +0100
@@ -42,6 +42,8 @@
 
 const uint16_t Ipv4L3Protocol::PROT_NUMBER = 0x0800;
 
+NS_OBJECT_ENSURE_REGISTERED (Ipv4L3Protocol);
+
 InterfaceId 
 Ipv4L3Protocol::iid (void)
 {