diff --git a/src/Provider.php b/src/Provider.php
index 840dfd7..ce8286c 100644
--- a/src/Provider.php
+++ b/src/Provider.php
@@ -77,7 +77,9 @@ public function getAccessToken($code)
             'form_params' => $this->getTokenFields($code),
         ]);
 
-        return $this->parseAccessToken($response->getBody()->getContents());
+        $this->credentialsResponseBody = json_decode($response->getBody(), true);
+
+        return $this->parseAccessToken($response->getBody());
     }
 
     /**