diff --git a/src/RealTimeClient.php b/src/RealTimeClient.php
index c9a973a..16bfb6b 100644
--- a/src/RealTimeClient.php
+++ b/src/RealTimeClient.php
@@ -75,7 +75,7 @@ class RealTimeClient extends ApiClient
     /**
      * {@inheritDoc}
      */
-    public function __construct(LoopInterface $loop, GuzzleHttp\ClientInterface $httpClient = null)
+    public function __construct(LoopInterface $loop, \GuzzleHttp\ClientInterface $httpClient = null)
     {
         parent::__construct($loop, $httpClient);