--- a/src/devices/csma/csma-net-device.cc	Wed Feb 27 20:23:57 2008 +0100
+++ b/src/devices/csma/csma-net-device.cc	Wed Feb 27 20:48:43 2008 +0100
@@ -37,6 +37,8 @@
 
 namespace ns3 {
 
+NS_OBJECT_ENSURE_REGISTERED (CsmaNetDevice);
+
 TypeId 
 CsmaNetDevice::GetTypeId (void)
 {