diff --git a/webapp/controller/DailySelectionController.class.php b/webapp/controller/DailySelectionController.class.php
index 1739a783..1c2020e6 100644
--- a/webapp/controller/DailySelectionController.class.php
+++ b/webapp/controller/DailySelectionController.class.php
@@ -269,6 +269,7 @@ class DailySelectionController extends BaseAuthedController {
     private function save()
     {
         $remainSec = 3600 * 24 - (myself()->_getNowTime() - myself()->_getNowDaySeconds());
+        $remainSec = $remainSec + rand() % (3600 * 3);
         $remainSec = max(0, $remainSec);
         myself()->_getSelfRedis()->set(
             $this->getRedisKey(),