diff --git a/app/Models/RequestCharacteristic.php b/app/Models/RequestCharacteristic.php
index 197dcd8..67a2339 100644
--- a/app/Models/RequestCharacteristic.php
+++ b/app/Models/RequestCharacteristic.php
@@ -34,7 +34,7 @@ class RequestCharacteristic extends Model
         'mail_status',
         'trigger_at',
         'work_flow_id',
-
+        'model_type',
         'created_at',
         'updated_at',
         'created_by',