diff --git a/models/Image.php b/models/Image.php
index 99a9fbe..212c1dc 100644
--- a/models/Image.php
+++ b/models/Image.php
@@ -158,7 +158,8 @@ class Image extends Asset
 		}
 
 		return Registry::get('db')->query('
-			DELETE FROM assets_thumbs
+			UPDATE assets_thumbs
+			SET filename = NULL
 			WHERE id_asset = {int:id_asset}',
 			['id_asset' => $this->id_asset]);
 	}