diff --git a/core/sip/trans_layer.cpp b/core/sip/trans_layer.cpp
index 7bcdf279..72841e33 100644
--- a/core/sip/trans_layer.cpp
+++ b/core/sip/trans_layer.cpp
@@ -2065,7 +2065,7 @@ int _trans_layer::update_uac_reply(trans_bucket* bucket, sip_trans* t, sip_msg*
 }
 
 int _trans_layer::update_uac_request(trans_bucket* bucket, sip_trans*& t,
-				     sip_msg* msg)
+				     sip_msg*& msg)
 {
     if(msg->u.request->method != sip_request::ACK){
 	t = bucket->add_trans(msg,TT_UAC);
diff --git a/core/sip/trans_layer.h b/core/sip/trans_layer.h
index cadd2910..504fab4b 100644
--- a/core/sip/trans_layer.h
+++ b/core/sip/trans_layer.h
@@ -278,7 +278,7 @@ protected:
      * @return transaction state if successfull
      */
     int update_uac_reply(trans_bucket* bucket, sip_trans* t, sip_msg* msg);
-    int update_uac_request(trans_bucket* bucket, sip_trans*& t, sip_msg* msg);
+    int update_uac_request(trans_bucket* bucket, sip_trans*& t, sip_msg*& msg);
 
     /**
      * Implements the state changes for the UAS state machine