diff -ur a/src/rtp.cxx b/src/rtp.cxx
--- a/src/rtp.cxx	2012-12-10 18:56:08.000000000 +0100
+++ b/src/rtp.cxx	2013-02-22 18:54:35.360358638 +0100
@@ -1164,9 +1164,13 @@
   return e_ProcessPacket;
 }
 
-
+#if PTRACING
 void RTP_Session::OnRxSenderReport(const SenderReport & PTRACE_PARAM(sender),
                                    const ReceiverReportArray & PTRACE_PARAM(reports))
+#else
+void RTP_Session::OnRxSenderReport(const SenderReport & sender,
+                                   const ReceiverReportArray & reports)
+#endif
 {
    userData->OnRxSenderReport(sessionID,sender,reports);