diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c
index 1350f1be8037..8229a52c2acd 100644
--- a/net/rxrpc/conn_event.c
+++ b/net/rxrpc/conn_event.c
@@ -70,7 +70,7 @@ static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
 	iov[2].iov_len	= sizeof(ack_info);
 
 	pkt.whdr.epoch		= htonl(conn->proto.epoch);
-	pkt.whdr.cid		= htonl(conn->proto.cid);
+	pkt.whdr.cid		= htonl(conn->proto.cid | channel);
 	pkt.whdr.callNumber	= htonl(call_id);
 	pkt.whdr.seq		= 0;
 	pkt.whdr.type		= chan->last_type;