diff --git a/app/Models/DocumentTemplateBasicField.php b/app/Models/DocumentTemplateBasicField.php
index 0f2c3ef9..4ea87e98 100644
--- a/app/Models/DocumentTemplateBasicField.php
+++ b/app/Models/DocumentTemplateBasicField.php
@@ -13,6 +13,7 @@ class DocumentTemplateBasicField extends Model
     protected $fillable = [
         'template_id',
         'label',
+        'field_key',
         'field_type',
         'default_value',
         'sort_order',