diff --git a/src/Elasticsearch/Endpoints/Indices/Open.php b/src/Elasticsearch/Endpoints/Indices/Open.php
index 6808659b5..6ea10671f 100644
--- a/src/Elasticsearch/Endpoints/Indices/Open.php
+++ b/src/Elasticsearch/Endpoints/Indices/Open.php
@@ -48,6 +48,7 @@ public function getParamWhitelist()
             'ignore_unavailable',
             'allow_no_indices',
             'expand_wildcards',
+            'wait_for_active_shards',
         );
     }