diff --git a/src/Elasticsearch/Client.php b/src/Elasticsearch/Client.php
index 776302f40..5b487a7f5 100644
--- a/src/Elasticsearch/Client.php
+++ b/src/Elasticsearch/Client.php
@@ -88,6 +88,7 @@ public function __construct($params = array())
         $this->cluster      = $this->params['clusterNamespace'];
         $this->nodes        = $this->params['nodesNamespace'];
         $this->snapshot     = $this->params['snapshotNamespace'];
+        $this->cat          = $this->params['catNamespace'];
         $this->dicEndpoints = $this->params['endpoint'];
     }