diff --git a/src/HAB/Solr/Facet/FacetCollection.php b/src/HAB/Solr/Facet/FacetCollection.php
index 5ea9e3ee3cb06cd0d93b5a9f043e534f90872188..bbb0267c2522425260b72cc013a59d210bf514cc 100644
--- a/src/HAB/Solr/Facet/FacetCollection.php
+++ b/src/HAB/Solr/Facet/FacetCollection.php
@@ -50,6 +50,13 @@ class FacetCollection implements Countable, IteratorAggregate, ParameterProvider
      */
     private $facets;
 
+    /**
+     * Component state filter.
+     *
+     * @var StateFilter\StateFilterInterface
+     */
+    private $filter;
+
     /**
      * Constructor.
      *