diff --git a/src/Credentials/ServiceAccountJwtAccessCredentials.php b/src/Credentials/ServiceAccountJwtAccessCredentials.php
index 16c7d59ca..8b2fb9454 100644
--- a/src/Credentials/ServiceAccountJwtAccessCredentials.php
+++ b/src/Credentials/ServiceAccountJwtAccessCredentials.php
@@ -151,7 +151,11 @@ public function fetchAuthToken(callable $httpHandler = null)
         // Set the self-signed access token in OAuth2 for getLastReceivedToken
         $this->auth->setAccessToken($access_token);
 
-        return ['access_token' => $access_token];
+        return [
+            'access_token' => $access_token,
+            'expires_in' => $this->auth->getExpiry(),
+            'token_type' => 'Bearer'
+        ];
     }
 
     /**