diff --git a/wp-admin/upgrade-schema.php b/wp-admin/upgrade-schema.php
index 2b4534e2d..06891a6a0 100644
--- a/wp-admin/upgrade-schema.php
+++ b/wp-admin/upgrade-schema.php
@@ -22,7 +22,7 @@ CREATE TABLE $wpdb->comments (
   comment_date_gmt datetime NOT NULL default '0000-00-00 00:00:00',
   comment_content text NOT NULL,
   comment_karma int(11) NOT NULL default '0',
-  comment_approved tinyint(1) NOT NULL default '1',
+  comment_approved enum('0','1') NOT NULL default '1',
   comment_agent varchar(255) NOT NULL default '',
   comment_type varchar(20) NOT NULL default '',
   comment_parent int(11) NOT NULL default '0',