--- a/src/mobility/mobility-model.cc	Sun Dec 30 19:36:44 2007 -0800
+++ b/src/mobility/mobility-model.cc	Wed Jan 02 09:09:24 2008 +0100
@@ -26,9 +26,7 @@
 const InterfaceId MobilityModel::iid = MakeInterfaceId ("MobilityModel", Object::iid);
 
 MobilityModel::MobilityModel ()
-{
-  SetInterfaceId (MobilityModel::iid);
-}
+{}
 
 MobilityModel::~MobilityModel ()
 {}