diff --git a/src/devices/wifi/nqap-wifi-mac.cc b/src/devices/wifi/nqap-wifi-mac.cc
index f72b865b5..4b9c8ce0b 100644
--- a/src/devices/wifi/nqap-wifi-mac.cc
+++ b/src/devices/wifi/nqap-wifi-mac.cc
@@ -97,6 +97,7 @@ NqapWifiMac::DoDispose (void)
   NS_LOG_FUNCTION (this);
   delete m_rxMiddle;
   delete m_dcfManager;
+  m_low->Dispose ();
   m_rxMiddle = 0;
   m_low = 0;
   m_dcfManager = 0;
diff --git a/src/devices/wifi/nqsta-wifi-mac.cc b/src/devices/wifi/nqsta-wifi-mac.cc
index 4a979500b..e7bceba8f 100644
--- a/src/devices/wifi/nqsta-wifi-mac.cc
+++ b/src/devices/wifi/nqsta-wifi-mac.cc
@@ -128,6 +128,7 @@ NqstaWifiMac::DoDispose (void)
   NS_LOG_FUNCTION (this);
   delete m_rxMiddle;
   delete m_dcfManager;
+  m_low->Dispose ();
   m_rxMiddle = 0;
   m_low = 0;
   m_dcfManager = 0;
diff --git a/src/devices/wifi/qap-wifi-mac.cc b/src/devices/wifi/qap-wifi-mac.cc
index 066bf0187..af9bb6938 100644
--- a/src/devices/wifi/qap-wifi-mac.cc
+++ b/src/devices/wifi/qap-wifi-mac.cc
@@ -119,10 +119,11 @@ void
 QapWifiMac::DoDispose ()
 {
   delete m_rxMiddle;
-  m_rxMiddle = 0;
   delete m_txMiddle;
-  m_txMiddle = 0;
   delete m_dcfManager;
+  m_low->Dispose ();
+  m_rxMiddle = 0;
+  m_txMiddle = 0;
   m_dcfManager = 0;
   m_low = 0;
   m_phy = 0;
diff --git a/src/devices/wifi/qsta-wifi-mac.cc b/src/devices/wifi/qsta-wifi-mac.cc
index cdb12ba27..e3c3fed5a 100644
--- a/src/devices/wifi/qsta-wifi-mac.cc
+++ b/src/devices/wifi/qsta-wifi-mac.cc
@@ -125,6 +125,7 @@ QstaWifiMac::DoDispose ()
   delete m_rxMiddle;
   delete m_txMiddle;
   delete m_dcfManager;
+  m_low->Dispose ();
   m_rxMiddle = 0;
   m_txMiddle = 0;
   m_low = 0;