diff --git a/db/update18.0.sql b/db/update18.0.sql
index 3a5e49f915..ecdd8e79a2 100644
--- a/db/update18.0.sql
+++ b/db/update18.0.sql
@@ -1,3 +1,3 @@
 ALTER TABLE `zt_story` ADD COLUMN `siblings` varchar(255) NOT NULL AFTER `linkRequirements`;
 
-ALTER TABLE `zt_productplan` MODIFY COLUMN `branch` varchar(255) NOT NULL;
+ALTER TABLE `zt_productplan` MODIFY COLUMN `branch` varchar(255) NOT NULL DEFAULT '0';
diff --git a/db/zentao.sql b/db/zentao.sql
index 22e8c942e3..f17e27812a 100755
--- a/db/zentao.sql
+++ b/db/zentao.sql
@@ -1129,7 +1129,7 @@ CREATE TABLE IF NOT EXISTS `zt_product` (
 CREATE TABLE IF NOT EXISTS `zt_productplan` (
   `id` mediumint(8) unsigned NOT NULL auto_increment,
   `product` mediumint(8) unsigned NOT NULL,
-  `branch` mediumint(8) unsigned NOT NULL,
+  `branch` varchar(255) NOT NULL DEFAULT '0',
   `parent` mediumint(9) NOT NULL DEFAULT '0',
   `title` varchar(90) NOT NULL,
   `status` enum('wait','doing','done','closed') NOT NULL default 'wait',