diff -r 3b5ef83fae25 src/devices/wifi/mac-low.cc
--- a/src/devices/wifi/mac-low.cc	Wed Jun 03 20:58:39 2009 +0200
+++ b/src/devices/wifi/mac-low.cc	Thu Jun 04 19:43:18 2009 +0400
@@ -801,7 +801,7 @@
       (*i)->NavReset (duration);
     }
   m_lastNavStart = Simulator::Now ();
-  m_lastNavStart = duration;
+  m_lastNavDuration = duration;
 }
 bool
 MacLow::DoNavStartNow (Time duration)