diff --git a/src/devices/wifi/dca-txop.cc b/src/devices/wifi/dca-txop.cc
index 83282f011..e35a4d487 100644
--- a/src/devices/wifi/dca-txop.cc
+++ b/src/devices/wifi/dca-txop.cc
@@ -139,10 +139,6 @@ void
 DcaTxop::DoDispose (void)
 {
   NS_LOG_FUNCTION (this);
-  m_transmissionListener = 0;
-  m_dcf = 0;
-  m_rng = 0;
-  m_txMiddle = 0;
   m_queue = 0;
   m_low = 0;
   m_stationManager = 0;
@@ -150,6 +146,10 @@ DcaTxop::DoDispose (void)
   delete m_dcf;
   delete m_rng;
   delete m_txMiddle;
+  m_transmissionListener = 0;
+  m_dcf = 0;
+  m_rng = 0;
+  m_txMiddle = 0;
 }
 
 void