diff --git a/library/TRXC_CodecPort.ttcn b/library/TRXC_CodecPort.ttcn
index 09b2977..bb2193f 100644
--- a/library/TRXC_CodecPort.ttcn
+++ b/library/TRXC_CodecPort.ttcn
@@ -59,7 +59,8 @@
 	msg := msg
 }
 
-function f_TRXC_transceive(TRXC_CODEC_PT pt, ConnectionId conn_id, TrxcMessage tx,
+function f_TRXC_transceive(TRXC_CODEC_PT pt, ConnectionId conn_id,
+			   template (value) TrxcMessage tx,
 			   template TrxcMessage tr := ?) return TrxcMessage {
 	var TRXC_RecvFrom rf;
 	timer T := 3.0;