diff -r 8aaa5e83939e -r 98aac83e4416 src/devices/wifi/mac-low.cc
--- a/src/devices/wifi/mac-low.cc	Tue Jul 07 21:18:01 2009 +0200
+++ b/src/devices/wifi/mac-low.cc	Tue Jul 07 23:43:47 2009 +0200
@@ -584,11 +584,11 @@
         {
           m_listener->GotAck (rxSnr, txMode);
         }
-    if (m_txParams.HasNextPacket ()) 
-      {
-        m_waitSifsEvent = Simulator::Schedule (GetSifs (), 
+      if (m_txParams.HasNextPacket ()) 
+        {
+          m_waitSifsEvent = Simulator::Schedule (GetSifs (), 
                                                &MacLow::WaitSifsAfterEndTx, this);
-      }
+        }
     } 
   else if (hdr.IsCtl ()) 
     {