--- a/src/devices/wifi/mac-tx-middle.cc	Sun Jan 11 23:26:34 2009 +0000
+++ b/src/devices/wifi/mac-tx-middle.cc	Mon Jan 12 13:35:41 2009 +0100
@@ -39,7 +39,7 @@
 {
   uint16_t retval;
   if (hdr->IsQosData () &&
-      !hdr->GetAddr1 ().IsBroadcast ()) 
+      !hdr->GetAddr1 ().IsGroup ()) 
     {
       uint8_t tid = hdr->GetQosTid ();
       NS_ASSERT (tid < 16);