diff --git a/phc2sys.c b/phc2sys.c
index b6f6719..e2b5c47 100644
--- a/phc2sys.c
+++ b/phc2sys.c
@@ -786,7 +786,7 @@ static int recv_subscribed(struct node *node, struct ptp_message *msg,
 			port->state = state;
 			clock = port->clock;
 			state = clock_compute_state(node, clock);
-			if (clock->state != state) {
+			if (clock->state != state || clock->new_state) {
 				clock->new_state = state;
 				node->state_changed = 1;
 			}