diff --git a/web/app/controllers/problem.php b/web/app/controllers/problem.php
index 9e38988..165ed56 100644
--- a/web/app/controllers/problem.php
+++ b/web/app/controllers/problem.php
@@ -424,7 +424,7 @@ $('#contest-countdown').countdown(<?= $contest['end_time']->getTimestamp() - UOJ
 <script>
 	$(document).ready(function() {
 		$('.markdown-body table').each(function() {
-			$(this).addClass('table', 'table-bordered', 'table-striped');
+			$(this).addClass('table table-bordered table-striped');
 		});
 	});
 </script>