diff --git a/src/lint/linter/__tests__/ArcanistNoLintTestCase.php b/src/lint/linter/__tests__/ArcanistNoLintTestCase.php
index e88322f8..1af9279d 100644
--- a/src/lint/linter/__tests__/ArcanistNoLintTestCase.php
+++ b/src/lint/linter/__tests__/ArcanistNoLintTestCase.php
@@ -8,6 +8,6 @@
  *
  * @group testcase
  */
-class ArcanistNoLintTestCaseMisnamed extends ArcanistLinterTestCase {
+final class ArcanistNoLintTestCaseMisnamed extends ArcanistLinterTestCase {
 
 }