diff --git a/library/BSSAP_CodecPort.ttcn b/library/BSSAP_CodecPort.ttcn
index fdece08..5339b32 100644
--- a/library/BSSAP_CodecPort.ttcn
+++ b/library/BSSAP_CodecPort.ttcn
@@ -126,7 +126,7 @@
   SCCP_PAR_Importance     importance   optional
 }
 
-template BSSAP_N_DATA_ind tr_BSSAP_DATA_ind(SCCP_PAR_Connection_Id conn_id,
+template BSSAP_N_DATA_ind tr_BSSAP_DATA_ind(template SCCP_PAR_Connection_Id conn_id,
 					    template PDU_BSSAP bssap := *) := {
 	userData := bssap,
 	connectionId := conn_id,