--- a/src/devices/wifi/mac-high-nqsta.cc	Wed Oct 31 11:45:04 2007 +0100
+++ b/src/devices/wifi/mac-high-nqsta.cc	Wed Oct 31 12:05:25 2007 +0100
@@ -69,7 +69,9 @@
 }
 
 MacHighNqsta::~MacHighNqsta ()
-{}
+{
+  m_phy = 0;
+}
 
 void 
 MacHighNqsta::SetDcaTxop (DcaTxop *dca)
@@ -97,7 +99,7 @@
   m_disAssociatedCallback = callback;
 }
 void 
-MacHighNqsta::SetPhy (WifiPhy *phy)
+MacHighNqsta::SetPhy (Ptr<WifiPhy> phy)
 {
   m_phy = phy;
 }