diff --git a/apps/mosquito/tasks.py b/apps/mosquito/tasks.py
index 90a3bf1..c6b2bbc 100644
--- a/apps/mosquito/tasks.py
+++ b/apps/mosquito/tasks.py
@@ -75,6 +75,7 @@ def update_daily_statistic():
                 increment = ret[d] - ret[d-timedelta(days=1)]
                 history, created = MosqPostStatistic.objects.update_or_create(date=d, total=ret[d], increment=increment)
             is_first = False
+        return _date_list
 
 
 @task()