diff --git a/ns3/ns-allinone-3.14.1/ns-3.14.1/src/wifi/model/block-ack-manager.cc b/ns3/ns-allinone-3.14.1/ns-3.14.1/src/wifi/model/block-ack-manager.cc
index f09432d..71084b5 100644
--- a/ns3/ns-allinone-3.14.1/ns-3.14.1/src/wifi/model/block-ack-manager.cc
+++ b/ns3/ns-allinone-3.14.1/ns-3.14.1/src/wifi/model/block-ack-manager.cc
@@ -240,9 +240,9 @@ BlockAckManager::GetNextPacket (WifiMacHeader &hdr)
 {
   NS_LOG_FUNCTION (this);
   Ptr<const Packet> packet = 0;
+  CleanupBuffers ();
   if (m_retryPackets.size () > 0)
     {
-      CleanupBuffers ();
       PacketQueueI queueIt = m_retryPackets.front ();
       packet = queueIt->packet;
       hdr = queueIt->hdr;