diff --git a/src/Sender/FCMSender.php b/src/Sender/FCMSender.php
index 7c2aeda4e..136295b14 100644
--- a/src/Sender/FCMSender.php
+++ b/src/Sender/FCMSender.php
@@ -105,7 +105,7 @@ public function sendToTopic(Topics $topics, Options $options = null, PayloadNoti
      *
      * @return null|\Psr\Http\Message\ResponseInterface
      */
-    private function post($request)
+    protected function post($request)
     {
         try {
             $responseGuzzle = $this->client->request('post', $this->url, $request->build());