diff --git a/tests/locallib_test.php b/tests/locallib_test.php
index 3cbf7b14..92bd0704 100644
--- a/tests/locallib_test.php
+++ b/tests/locallib_test.php
@@ -24,7 +24,7 @@
  * @copyright  2022 onwards Eloy Lafuente (stronk7) {@link https://stronk7.com}
  * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class locallib_test extends \basic_testcase {
+final class locallib_test extends \basic_testcase {
 
     /**
      * Data provider for test_local_codechecker_find_other_files()