diff --git a/src/loop.c b/src/loop.c
index 4420c135..0057226c 100644
--- a/src/loop.c
+++ b/src/loop.c
@@ -192,7 +192,7 @@ int mosquitto_main_loop(struct mosquitto__listener_sock *listensock, int listens
 		context__free_disused();
 #ifdef WITH_SYS_TREE
 		if(db.config->sys_interval > 0){
-			sys_tree__update(db.config->sys_interval);
+			sys_tree__update();
 		}
 #endif
 
diff --git a/src/mosquitto_broker_internal.h b/src/mosquitto_broker_internal.h
index 22f8a414..a07a3a33 100644
--- a/src/mosquitto_broker_internal.h
+++ b/src/mosquitto_broker_internal.h
@@ -680,7 +680,7 @@ int db__message_reconnect_reset(struct mosquitto *context);
 bool db__ready_for_flight(struct mosquitto_msg_data *msgs, int qos);
 bool db__ready_for_queue(struct mosquitto *context, int qos, struct mosquitto_msg_data *msg_data);
 void sys_tree__init(void);
-void sys_tree__update(int interval);
+void sys_tree__update(void);
 int db__message_write_inflight_out_all(struct mosquitto *context);
 int db__message_write_inflight_out_latest(struct mosquitto *context);
 int db__message_write_queued_out(struct mosquitto *context);
diff --git a/src/sys_tree.c b/src/sys_tree.c
index 4c3908e1..9a5d8f4e 100644
--- a/src/sys_tree.c
+++ b/src/sys_tree.c
@@ -157,7 +157,7 @@ static void calc_load(char *buf, const char *topic, bool initial, double exponen
  * messages are sent for the $SYS hierarchy.
  * 'start_time' is the result of time() that the broker was started at.
  */
-void sys_tree__update(int interval)
+void sys_tree__update(void)
 {
 	static time_t last_update = 0;
 	time_t uptime;
@@ -220,7 +220,9 @@ void sys_tree__update(int interval)
 	uint32_t len;
 	bool initial_publish;
 
-	if(interval && db.now_s - interval > last_update){
+	if(db.config->sys_interval
+			&& db.now_s - db.config->sys_interval > last_update){
+
 		uptime = db.now_s - start_time;
 		len = (uint32_t)snprintf(buf, BUFLEN, "%d seconds", (int)uptime);
 		db__messages_easy_queue(NULL, "$SYS/broker/uptime", SYS_TREE_QOS, len, buf, 1, 60, NULL);