diff --git a/lib/access-token.js b/lib/access-token.js
index 528371d..337d08c 100644
--- a/lib/access-token.js
+++ b/lib/access-token.js
@@ -49,7 +49,7 @@ module.exports = class AccessToken {
     const response = await this.#client.request(this.#config.auth.refreshPath, parameters.toObject(), httpOptions);
 
     if (response[REFRESH_TOKEN_PROPERTY_NAME] === undefined) {
-      response.refresh_token = this.refresh_token;
+      response.refresh_token = this.token.refresh_token;
     }
     return new AccessToken(this.#config, this.#client, response);
   }
diff --git a/test/access-token-refresh.js b/test/access-token-refresh.js
index bf4f7ef..aaa1360 100644
--- a/test/access-token-refresh.js
+++ b/test/access-token-refresh.js
@@ -290,8 +290,10 @@ test.serial('@refresh => creates a new access token with keeping the old refresh
   const scope = server.tokenSuccessWithoutRefreshToken(scopeOptions, refreshParams);
 
   const accessToken = new AccessToken(config, client, accessTokenResponse);
+  const refreshToken = accessToken.token.refresh_token;
   const refreshAccessToken = await accessToken.refresh();
 
   scope.done();
   t.true(has(refreshAccessToken.token, 'refresh_token'));
+  t.is(refreshAccessToken.token.refresh_token, refreshToken);
 });