--- a/src/wifi/model/mac-low.cc	Fri Jul 24 08:59:57 2015 +0200
+++ b/src/wifi/model/mac-low.cc	Tue Jul 28 19:55:54 2015 +0200
@@ -1487,7 +1487,7 @@
       (*i)->NavReset (duration);
     }
   m_lastNavStart = Simulator::Now ();
-  m_lastNavStart = duration;
+  m_lastNavDuration = duration;
 }
 
 bool