diff -r 591e912d459a -r 872e554039c3 src/devices/wifi/mac-low.cc
--- a/src/devices/wifi/mac-low.cc	Fri Jul 10 18:43:24 2009 +0400
+++ b/src/devices/wifi/mac-low.cc	Thu Jul 16 11:51:24 2009 +0400
@@ -585,11 +585,11 @@
         {
           m_listener->GotAck (rxSnr, txMode);
         }
-    if (m_txParams.HasNextPacket ()) 
-      {
-        m_waitSifsEvent = Simulator::Schedule (GetSifs (), 
-                                               &MacLow::WaitSifsAfterEndTx, this);
-      }
+      if (m_txParams.HasNextPacket ()) 
+        {
+          m_waitSifsEvent = Simulator::Schedule (GetSifs (), 
+                                                 &MacLow::WaitSifsAfterEndTx, this);
+        }
     } 
   else if (hdr.IsCtl ()) 
     {