diff --git a/src/devices/wifi/mac-low.cc b/src/devices/wifi/mac-low.cc
index ea9243d21..f98124adb 100644
--- a/src/devices/wifi/mac-low.cc
+++ b/src/devices/wifi/mac-low.cc
@@ -271,6 +271,7 @@ void
 MacLow::DoDispose (void)
 {
   NS_LOG_FUNCTION (this);
+  m_listener = 0;
   CancelAllEvents ();
   m_phy = 0;
   m_stationManager = 0;