Index: wp-admin/includes/schema.php
===================================================================
--- wp-admin/includes/schema.php	(revision 17660)
+++ wp-admin/includes/schema.php	(working copy)
@@ -103,7 +103,6 @@
 ) $charset_collate;
 CREATE TABLE $wpdb->options (
   option_id bigint(20) unsigned NOT NULL auto_increment,
-  blog_id int(11) NOT NULL default '0',
   option_name varchar(64) NOT NULL default '',
   option_value longtext NOT NULL,
   autoload varchar(20) NOT NULL default 'yes',