diff --git a/models/Image.php b/models/Image.php
index 8a698b1..e0ae001 100644
--- a/models/Image.php
+++ b/models/Image.php
@@ -60,7 +60,7 @@ class Image extends \yii\db\ActiveRecord
     {
         return [
             [['sha256', 'original_name'], 'required'],
-            [['original_name'], 'match', '/^[a-z0-9-_]+(|\.[\w\d]+)$/i'],
+            [['original_name'], 'match', 'pattern' => '/^[a-z0-9-_]+(|\.[\w\d]+)$/i'],
         ];
     }