diff --git a/public/mod/forum/lib.php b/public/mod/forum/lib.php
index 00d171f3e32..bfec579be4d 100644
--- a/public/mod/forum/lib.php
+++ b/public/mod/forum/lib.php
@@ -4043,7 +4043,7 @@ function forum_print_recent_mod_activity($activity, $courseid, $detail, $modname
         'border' => '0',
         'cellpadding' => '3',
         'cellspacing' => '0',
-        'class' => 'forum-recent'
+        'class' => 'forum-recent table-reboot',
     ];
     $output = html_writer::start_tag('table', $tableoptions);
     $output .= html_writer::start_tag('tr');