--- a/src/devices/wifi/mac-low.cc	Fri Aug 20 12:17:19 2010 -0700
+++ b/src/devices/wifi/mac-low.cc	Sun Aug 22 22:51:33 2010 +0200
@@ -1524,7 +1524,7 @@
       agreement.SetDelayedBlockAck ();
     }
   agreement.SetAmsduSupport (respHdr->IsAmsduSupported ());
-  agreement.SetBufferSize (respHdr->GetBufferSize ());
+  agreement.SetBufferSize (respHdr->GetBufferSize () + 1);
   agreement.SetTimeout (respHdr->GetTimeout ());
   agreement.SetStartingSequence (startingSeq);