diff --git a/app/Models/ProductionPlan.php b/app/Models/ProductionPlan.php
index 4942dd41c..b20a2c166 100644
--- a/app/Models/ProductionPlan.php
+++ b/app/Models/ProductionPlan.php
@@ -13,6 +13,7 @@ class ProductionPlan extends Model
     protected $fillable = [
         "plant_id",
         "shift_id",
+        "created_at",
         "line_id",
         "plan_quantity",
         "production_quantity",