--- a/src/wifi/model/mac-low.cc	Mon Sep 28 20:23:11 2015 -0700
+++ b/src/wifi/model/mac-low.cc	Sat Oct 10 11:01:44 2015 +0200
@@ -365,8 +365,7 @@
     m_listener (0),
     m_phyMacLowListener (0),
     m_ctsToSelfSupported (false),
-    m_receivedAtLeastOneMpdu (false),
-    m_mpduReferenceNumber (0)
+    m_receivedAtLeastOneMpdu (false)
 {
   NS_LOG_FUNCTION (this);
   m_lastNavDuration = Seconds (0);
@@ -1605,7 +1604,7 @@
                 ", seq=0x" << std::hex << m_currentHdr.GetSequenceControl () << std::dec);
   if (!m_ampdu || hdr->IsRts ())
     {
-      m_phy->SendPacket (packet, txVector, preamble, 0, 0);
+      m_phy->SendPacket (packet, txVector, preamble, 0);
     }
   else
     {
@@ -1658,11 +1657,11 @@
                 {
                   packetType = 0;
                 }
-              m_phy->SendPacket (newPacket, txVector, preamble, packetType, m_mpduReferenceNumber);
+              m_phy->SendPacket (newPacket, txVector, preamble, packetType);
             }
           else
             {
-              Simulator::Schedule (delay, &MacLow::SendPacket, this, newPacket, txVector, preamble, packetType, m_mpduReferenceNumber);
+              Simulator::Schedule (delay, &MacLow::SendPacket, this, newPacket, txVector, preamble, packetType);
             }
           if (queueSize > 1)
             {
@@ -1670,15 +1669,14 @@
             }
           preamble = WIFI_PREAMBLE_NONE;
         }
-      m_mpduReferenceNumber = ((m_mpduReferenceNumber + 1) % 4294967296);
     }
 }
 
 void
-MacLow::SendPacket (Ptr<const Packet> packet, WifiTxVector txVector, WifiPreamble preamble, uint8_t packetType, uint32_t mpduReferenceNumber)
+MacLow::SendPacket (Ptr<const Packet> packet, WifiTxVector txVector, WifiPreamble preamble, uint8_t packetType)
 {
   NS_LOG_DEBUG ("Sending MPDU as part of A-MPDU");
-  m_phy->SendPacket (packet, txVector, preamble, packetType, mpduReferenceNumber);
+  m_phy->SendPacket (packet, txVector, preamble, packetType);
 }
 
 void