diff -r ac896a31075c -r 87648432f1ca src/devices/wifi/mac-low.cc
--- a/src/devices/wifi/mac-low.cc	Mon Jun 08 15:48:46 2009 +0400
+++ b/src/devices/wifi/mac-low.cc	Mon Jun 08 16:30:52 2009 +0400
@@ -805,7 +805,7 @@
       (*i)->NavReset (duration);
     }
   m_lastNavStart = Simulator::Now ();
-  m_lastNavStart = duration;
+  m_lastNavDuration = duration;
 }
 bool
 MacLow::DoNavStartNow (Time duration)