--- a/src/mobility/hierarchical-mobility-model.cc	Wed Jan 02 09:09:24 2008 +0100
+++ b/src/mobility/hierarchical-mobility-model.cc	Wed Jan 02 09:25:31 2008 +0100
@@ -27,9 +27,9 @@
     m_parent (parent)
 {
   Ptr<MobilityModelNotifier> childNotifier = 
-    m_child->QueryInterface<MobilityModelNotifier> (MobilityModelNotifier::iid);
+    m_child->QueryInterface<MobilityModelNotifier> ();
   Ptr<MobilityModelNotifier> parentNotifier = 
-    m_parent->QueryInterface<MobilityModelNotifier> (MobilityModelNotifier::iid);
+    m_parent->QueryInterface<MobilityModelNotifier> ();
   if (childNotifier == 0)
     {
       childNotifier = CreateObject<MobilityModelNotifier> ();