diff --git a/adm/config_form.php b/adm/config_form.php
index d16789b9f..0c0f1f663 100644
--- a/adm/config_form.php
+++ b/adm/config_form.php
@@ -42,7 +42,7 @@ if(!isset($config['cf_adult_check'])) {
 
 if(!isset($config['cf_kcpcert_use'])) {
     sql_query(" ALTER TABLE `{$g4['config_table']}`
-                    ADD `cf_kcpcert_use` TINYINT(4) NOT NULL AFTER `cf_memo_send_point` ", TRUE);
+                    ADD `cf_kcpcert_use` TINYINT(4) NOT NULL DEFAULT '0' AFTER `cf_memo_send_point` ", TRUE);
 }
 
 if(!isset($config['cf_mobile_pages'])) {