--- a/src/mobility/hierarchical-mobility-model.cc	Mon Apr 14 16:19:17 2008 -0700
+++ b/src/mobility/hierarchical-mobility-model.cc	Thu Apr 17 13:42:25 2008 -0700
@@ -32,11 +32,11 @@
     .SetParent<MobilityModel> ()
     .AddConstructor<HierarchicalMobilityModel> ()
     .AddAttribute ("Child", "The child mobility model.",
-                   Pointer (),
+                   PointerValue (),
                    MakePointerAccessor (&HierarchicalMobilityModel::SetChild),
                    MakePointerChecker<MobilityModel> ())
     .AddAttribute ("Parent", "The parent mobility model.",
-                   Pointer (),
+                   PointerValue (),
                    MakePointerAccessor (&HierarchicalMobilityModel::SetParent),
                    MakePointerChecker<MobilityModel> ())
     ;