diff --git a/src/SwiftAdapter.php b/src/SwiftAdapter.php
index e08dfd9..a7de05b 100644
--- a/src/SwiftAdapter.php
+++ b/src/SwiftAdapter.php
@@ -344,7 +344,10 @@ protected function getObject(string $path): StorageObject
         return $object;
     }
 
-    protected function normalizeObject(StorageObject $object): FileAttributes|DirectoryAttributes
+    /**
+     * @return FileAttributes|DirectoryAttributes
+     */
+    protected function normalizeObject(StorageObject $object)
     {
         $name = $this->prefixer->stripDirectoryPrefix($object->name);