diff --git a/wp-admin/upgrade-schema.php b/wp-admin/upgrade-schema.php
index d39af9b9bc..4f2813c9d9 100644
--- a/wp-admin/upgrade-schema.php
+++ b/wp-admin/upgrade-schema.php
@@ -23,6 +23,7 @@ CREATE TABLE $wpdb->comments (
   comment_content text NOT NULL,
   comment_karma int(11) NOT NULL default '0',
   comment_approved enum('0','1') NOT NULL default '1',
+  comment_agent varchar(255) NOT NULL default '',
   user_id int(11) NOT NULL default '0',
   PRIMARY KEY  (comment_ID),
   KEY comment_approved (comment_approved),
@@ -115,6 +116,7 @@ CREATE TABLE $wpdb->posts (
   post_modified_gmt datetime NOT NULL default '0000-00-00 00:00:00',
   post_content_filtered text NOT NULL,
   post_parent int(11) NOT NULL default '0',
+  guid varchar(255) NOT NULL default '',
   PRIMARY KEY  (ID),
   KEY post_date_gmt (post_date_gmt),
   KEY post_name (post_name),