diff --git a/webapp/controller/ActivityController.class.php b/webapp/controller/ActivityController.class.php
index 5a55128..79b51bf 100644
--- a/webapp/controller/ActivityController.class.php
+++ b/webapp/controller/ActivityController.class.php
@@ -460,7 +460,7 @@ class ActivityController{
                     $now_days = $last_conf['day'];
                 }
                 if (!$now_days) {
-                    $now_days == 1;
+                    $now_days = 1;
                 }
             }
             $ret = $conn->execScript('UPDATE activity SET video_times=:video_times,item_id=:item_id, item_num=:item_num, modify_time=:modify_time, now_days=:now_days ' .