diff --git a/src/Gaufrette/Adapter/GoogleCloudStorage.php b/src/Gaufrette/Adapter/GoogleCloudStorage.php
index 295dcad1..f2a37390 100644
--- a/src/Gaufrette/Adapter/GoogleCloudStorage.php
+++ b/src/Gaufrette/Adapter/GoogleCloudStorage.php
@@ -126,7 +126,7 @@ public function read($key)
             if ($response->getStatusCode() == 200) {
                 $this->setMetadata($key, $object->getMetadata());
 
-                return $response->getBody();
+                return (string) $response->getBody();
             }
         }