diff --git a/src/Elasticsearch/Namespaces/IndicesNamespace.php b/src/Elasticsearch/Namespaces/IndicesNamespace.php
index db4115f77..dd2d5f956 100644
--- a/src/Elasticsearch/Namespaces/IndicesNamespace.php
+++ b/src/Elasticsearch/Namespaces/IndicesNamespace.php
@@ -232,7 +232,7 @@ public function delete($params = array())
      */
     public function stats($params = array())
     {
-        $metric = $this->extractArgument($params, '$metric');
+        $metric = $this->extractArgument($params, 'metric');
 
         $index = $this->extractArgument($params, 'index');