diff --git a/app/Models/CustomFieldset.php b/app/Models/CustomFieldset.php
index 1cf1807d8..a2698d818 100644
--- a/app/Models/CustomFieldset.php
+++ b/app/Models/CustomFieldset.php
@@ -87,7 +87,7 @@ class CustomFieldset extends Model
             }
 
             if ($field->is_unique == '1') {
-                    $rule[] = 'unique';
+                    $rule[] = 'unique_undeleted';
             }
 
             array_push($rule, $field->attributes['format']);