diff --git a/webapp/services/MissionService.php b/webapp/services/MissionService.php
index f829550c..a98cbdc6 100644
--- a/webapp/services/MissionService.php
+++ b/webapp/services/MissionService.php
@@ -595,8 +595,8 @@ class MissionService extends BaseService {
             return;
         }
 
-        foreach (array_rand($metas, count($metas)) as $key) {
-            $meta = $metas[array_rand($metas,1)];
+        foreach (array_rand($metas, 5) as $key) {
+            $meta = $metas[$key];
             if ($this->getMissionsCount() >=
                 $wantedRefreshMissionNum) {
                 break;