--- a/src/devices/wifi/mac-low.cc	Mon Jun 08 13:47:04 2009 +0200
+++ b/src/devices/wifi/mac-low.cc	Mon Jun 08 13:50:38 2009 +0200
@@ -804,7 +804,7 @@
       (*i)->NavReset (duration);
     }
   m_lastNavStart = Simulator::Now ();
-  m_lastNavStart = duration;
+  m_lastNavDuration = duration;
 }
 bool
 MacLow::DoNavStartNow (Time duration)