diff --git a/tests/php-unit-tests/unitary-tests/core/DBSearchTest.php b/tests/php-unit-tests/unitary-tests/core/DBSearchTest.php
index 7199e6361..9db42ce28 100644
--- a/tests/php-unit-tests/unitary-tests/core/DBSearchTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/DBSearchTest.php
@@ -30,6 +30,7 @@ namespace Combodo\iTop\Test\UnitTest\Core;
 use CMDBSource;
 use Combodo\iTop\Test\UnitTest\ItopDataTestCase;
 use CoreOqlMultipleResultsForbiddenException;
+use DBObjectSet;
 use DBSearch;
 use Exception;
 use Expression;