--- a/src/devices/wifi/dca-txop.h	Thu Feb 25 13:51:59 2010 +0100
+++ b/src/devices/wifi/dca-txop.h	Thu Feb 25 14:17:21 2010 +0100
@@ -141,7 +141,7 @@
 
   void RestartAccessIfNeeded (void);
   void StartAccessIfNeeded (void);
-  bool NeedRts (void);
+  bool NeedRts (Ptr<const Packet> packet, const WifiMacHeader *header);
   bool NeedRtsRetransmission (void);
   bool NeedDataRetransmission (void);
   bool NeedFragmentation (void);