diff --git a/src/libmsc/transaction.c b/src/libmsc/transaction.c
index b909cd8..d6f8c3b 100644
--- a/src/libmsc/transaction.c
+++ b/src/libmsc/transaction.c
@@ -146,6 +146,7 @@
 		.callref = callref,
 		.net = net,
 	};
+	trans->log_subsys = trans_log_subsys(trans);
 	vlr_subscr_get(vsub, trans_vsub_use(type));
 	llist_add_tail(&trans->entry, &net->trans_list);