diff --git a/src/CosAdapter.php b/src/CosAdapter.php
index 9ed2cc8..ed7c75b 100644
--- a/src/CosAdapter.php
+++ b/src/CosAdapter.php
@@ -421,7 +421,7 @@ public function getMetadata($path)
         return $this->getClient()->headObject([
             'Bucket' => $this->getBucket(),
             'Key' => $path,
-        ])->toArray();
+        ]);
     }
 
     /**