diff --git a/net/tipc/monitor.c b/net/tipc/monitor.c
index a94b9b36a700..1a438e312d66 100644
--- a/net/tipc/monitor.c
+++ b/net/tipc/monitor.c
@@ -632,9 +632,10 @@ static void mon_timeout(struct timer_list *t)
 {
 	struct tipc_monitor *mon = timer_container_of(mon, t, timer);
 	struct tipc_peer *self;
-	int best_member_cnt = dom_size(mon->peer_cnt) - 1;
+	int best_member_cnt;
 
 	write_lock_bh(&mon->lock);
+	best_member_cnt = dom_size(mon->peer_cnt) - 1;
 	self = mon->self;
 	if (self && (best_member_cnt != self->applied)) {
 		mon_update_local_domain(mon);