diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index c9ef3db737d9..6751ed4e0c07 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -186,7 +186,7 @@ static void br_record_config_information(struct net_bridge_port *p,
 	p->designated_cost = bpdu->root_path_cost;
 	p->designated_bridge = bpdu->bridge_id;
 	p->designated_port = bpdu->port_id;
-	p->designated_age = jiffies + bpdu->message_age;
+	p->designated_age = jiffies - bpdu->message_age;
 
 	mod_timer(&p->message_age_timer, jiffies
 		  + (p->br->max_age - bpdu->message_age));