diff --git a/mod/forum/renderer.php b/mod/forum/renderer.php
index 4ed73db7df4..1a43cc90a9d 100644
--- a/mod/forum/renderer.php
+++ b/mod/forum/renderer.php
@@ -102,7 +102,7 @@ class mod_forum_renderer extends plugin_renderer_base {
         $potentialcell->attributes['class'] = 'potential';
 
         $table = new html_table();
-        $table->attributes['class'] = 'subscribertable boxaligncenter';
+        $table->attributes['class'] = 'subscribertable boxaligncenter table-reboot';
         $table->data = array(new html_table_row(array($existingcell, $actioncell, $potentialcell)));
         $output .= html_writer::table($table);