diff --git a/src/Socialite/PassportProvider.php b/src/Socialite/PassportProvider.php
index 94dd3d2..17fec18 100644
--- a/src/Socialite/PassportProvider.php
+++ b/src/Socialite/PassportProvider.php
@@ -46,7 +46,7 @@ protected function getUserByToken($token)
             ],
         ]);
 
-        return json_decode($response->getBody(), true);
+        return json_decode((string) $response->getBody(), true);
     }
 
     protected function mapUserToObject(array $user)