diff --git a/src/wifi/model/qos-blocked-destinations.cc b/src/wifi/model/qos-blocked-destinations.cc
index 464fd0bba..d4c63ffe2 100644
--- a/src/wifi/model/qos-blocked-destinations.cc
+++ b/src/wifi/model/qos-blocked-destinations.cc
@@ -34,36 +34,19 @@ QosBlockedDestinations::~QosBlockedDestinations ()
 bool
 QosBlockedDestinations::IsBlocked (Mac48Address dest, uint8_t tid) const
 {
-  for (BlockedPacketsCI i = m_blockedQosPackets.begin (); i != m_blockedQosPackets.end (); i++)
-    {
-      if (i->first == dest && i->second == tid)
-        {
-          return true;
-        }
-    }
-  return false;
+  return m_blockedQosPackets.find ({dest, tid}) != m_blockedQosPackets.end ();
 }
 
 void
 QosBlockedDestinations::Block (Mac48Address dest, uint8_t tid)
 {
-  if (!IsBlocked (dest, tid))
-    {
-      m_blockedQosPackets.push_back (std::make_pair (dest, tid));
-    }
+  m_blockedQosPackets.insert ({dest, tid});
 }
 
 void
 QosBlockedDestinations::Unblock (Mac48Address dest, uint8_t tid)
 {
-  for (BlockedPacketsI i = m_blockedQosPackets.begin (); i != m_blockedQosPackets.end (); i++)
-    {
-      if (i->first == dest && i->second == tid)
-        {
-          m_blockedQosPackets.erase (i);
-          break;
-        }
-    }
+  m_blockedQosPackets.erase ({dest, tid});
 }
 
 } //namespace ns3
diff --git a/src/wifi/model/qos-blocked-destinations.h b/src/wifi/model/qos-blocked-destinations.h
index 840009ef0..05b6c6aee 100644
--- a/src/wifi/model/qos-blocked-destinations.h
+++ b/src/wifi/model/qos-blocked-destinations.h
@@ -22,7 +22,7 @@
 #ifndef QOS_BLOCKED_DESTINATIONS_H
 #define QOS_BLOCKED_DESTINATIONS_H
 
-#include <list>
+#include <set>
 #include "ns3/mac48-address.h"
 
 namespace ns3 {
@@ -67,19 +67,7 @@ public:
 
 
 private:
-  /**
-   * typedef for a list of <Mac48Address, TID> pair.
-   */
-  typedef std::list<std::pair<Mac48Address, uint8_t> > BlockedPackets;
-  /**
-   * typedef for an iterator of BlockedPackets
-   */
-  typedef std::list<std::pair<Mac48Address, uint8_t> >::iterator BlockedPacketsI;
-  /**
-   * typedef for a constan iterator of BlockedPackets
-   */
-  typedef std::list<std::pair<Mac48Address, uint8_t> >::const_iterator BlockedPacketsCI;
-  BlockedPackets m_blockedQosPackets;
+  std::set<std::pair<Mac48Address, uint8_t>> m_blockedQosPackets;
 };
 
 } //namespace ns3