diff --git a/tests/lib/Persistence/ValueObject/ContentInfoTest.php b/tests/lib/Persistence/ValueObject/ContentInfoTest.php
index 64f77eeae7..0d60506e73 100644
--- a/tests/lib/Persistence/ValueObject/ContentInfoTest.php
+++ b/tests/lib/Persistence/ValueObject/ContentInfoTest.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\Tests\Core\Persistence\ValueObject;
 
 use Ibexa\Contracts\Core\Persistence\Content\ContentInfo;