diff --git a/src/socketio-server/src/SocketIO.php b/src/socketio-server/src/SocketIO.php
index a75e4068f..5e92eb525 100644
--- a/src/socketio-server/src/SocketIO.php
+++ b/src/socketio-server/src/SocketIO.php
@@ -324,6 +324,9 @@ class SocketIO implements OnMessageInterface, OnOpenInterface, OnCloseInterface
         return $this;
     }
 
+    /**
+     * @deprecated use SocketIOConfig::getClientCallbackTimeout() instead
+     */
     private function getClientCallbackTimeout(): int
     {
         if ($this->clientCallbackTimeout !== 10000) {