diff --git a/webapp/controller/MissionController.class.php b/webapp/controller/MissionController.class.php
index de2af0f..5c086b1 100644
--- a/webapp/controller/MissionController.class.php
+++ b/webapp/controller/MissionController.class.php
@@ -1,5 +1,6 @@
 <?php
 
+require_once('mt/Parameter.php');
 require_once('mt/Drop.php');
 require_once('mt/Task.php');
 require_once('mt/Season.php');
@@ -96,7 +97,7 @@ class MissionController extends BaseAuthedController {
         }
         $this->_rspData(array(
             'current_active_value' => $this->_getV(TN_ACTIVE, 0),
-            'max_active_value' => 0,
+            'max_active_value' => mt\Parameter::getVal('max_activity', 0),
             'mission_list1' => $missionDtoList1,
             'mission_list2' => $missionDtoList2
         ));