diff --git a/src/HAB/Solr/Command/Search.php b/src/HAB/Solr/Command/Search.php
index 4b72abcb0e4104b5e981dae0a7a06a1e5d3b3e52..cca4624f32fc3d144944ab189a801f88179d29ce 100644
--- a/src/HAB/Solr/Command/Search.php
+++ b/src/HAB/Solr/Command/Search.php
@@ -60,10 +60,10 @@ class Search implements CommandInterface
      */
     private $builder;
 
-    public function __construct ($handler, QueryBuilderInterface $builder)
+    public function __construct ($handler, QueryBuilderInterface $builder = null)
     {
         $this->handler = $handler;
-        $this->builder = $builder;
+        $this->builder = $builder ?: new QueryBuilder();
     }
 
     /**