diff --git a/src/wifi/model/ap-wifi-mac.cc b/src/wifi/model/ap-wifi-mac.cc
index 10766c595..c60568cfd 100644
--- a/src/wifi/model/ap-wifi-mac.cc
+++ b/src/wifi/model/ap-wifi-mac.cc
@@ -458,9 +458,9 @@ ApWifiMac::GetEdcaParameterSet (void) const
 {
   NS_LOG_FUNCTION (this);
   EdcaParameterSet edcaParameters;
-  edcaParameters.SetQosSupported (1);
   if (m_qosSupported)
     {
+      edcaParameters.SetQosSupported (1);
       Ptr<EdcaTxopN> edca;
       Time txopLimit;