diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
index 7d372e0..21c1c45 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
@@ -126,7 +126,7 @@ static int iot_mqtt_send_subscribe(void) {
     iot_make_topic(topic, sizeof(topic), "srv", "config", "query");
     topics[count].cstring = topic; topics[count].lenstring.len = 0; count++;
 
-    iot_make_topic(topic, sizeof(topic), "srv", "ctrl");
+    iot_make_topic(topic, sizeof(topic), "srv", "ctrl", NULL);
     topics[count].cstring = topic; topics[count].lenstring.len = 0; count++;
 
     len = MQTTSerialize_subscribe(buf, sizeof(buf), 0,