diff --git a/src/lib/Query/Location/CriterionVisitor/Location/IsBookmarked.php b/src/lib/Query/Location/CriterionVisitor/Location/IsBookmarked.php
index 1603ffd..348e583 100644
--- a/src/lib/Query/Location/CriterionVisitor/Location/IsBookmarked.php
+++ b/src/lib/Query/Location/CriterionVisitor/Location/IsBookmarked.php
@@ -4,6 +4,8 @@
  * @copyright Copyright (C) Ibexa AS. All rights reserved.
  * @license For full copyright and license information view LICENSE file distributed with this source code.
  */
+declare(strict_types=1);
+
 namespace Ibexa\Solr\Query\Location\CriterionVisitor\Location;
 
 use Ibexa\Contracts\Core\Exception\InvalidArgumentException;