diff --git a/src/OAuth2.php b/src/OAuth2.php
index 137d008..2f08fe6 100644
--- a/src/OAuth2.php
+++ b/src/OAuth2.php
@@ -210,7 +210,7 @@ public function refreshAccessToken(OAuthToken $token)
 
         $response = $this->sendRequest($request);
 
-        $token = $this->createToken(['params' => $response]);
+        $token = $this->createToken(['params' => array_merge($token->getParams(), $response)]);
         $this->setAccessToken($token);
 
         return $token;