diff --git a/adm/board_form.php b/adm/board_form.php
index d9affee10..f090ceed7 100644
--- a/adm/board_form.php
+++ b/adm/board_form.php
@@ -46,9 +46,11 @@ if (!isset($board['bo_mobile_content_head'])) {
 }
 
 if (!isset($board['bo_use_cert'])) {
-    sql_query(" ALTER TABLE `{$g4['board_table']}`  ADD `bo_use_cert` ENUM('','cert','adult') NOT NULL DEFAULT 'none' AFTER `bo_use_email` ", false);
+    sql_query(" ALTER TABLE `{$g4['board_table']}`  ADD `bo_use_cert` ENUM('','cert','adult') NOT NULL DEFAULT '' AFTER `bo_use_email` ", false);
 }
 
+sql_query(" ALTER TABLE `{$g4['board_table']}` CHANGE `bo_use_cert` `bo_use_cert` ENUM('','cert','adult') NOT NULL DEFAULT '' ", false);
+
 $required = "";
 $readonly = "";
 if ($w == '') {