diff --git a/AlarmClock/entry/src/main/ets/model/ReminderService.ets b/AlarmClock/entry/src/main/ets/model/ReminderService.ets
index 8641b4d601fe3e9b1cf6f6d030df8b7d00ed2987..c7bb34bacf00120bf677244b1fbcb920c87f0b15 100644
--- a/AlarmClock/entry/src/main/ets/model/ReminderService.ets
+++ b/AlarmClock/entry/src/main/ets/model/ReminderService.ets
@@ -43,7 +43,7 @@ export default class ReminderService {
   public addReminder(alarmItem: ReminderItem, callback?: (reminderId: number) => void) {
     let reminder = this.initReminder(alarmItem);
     reminderAgent.publishReminder(reminder, (err, reminderId: number) => {
-      if (callback != null) {
+      if (!!callback) {
         callback(reminderId);
       }
     });