Unknown column 'serialized'

Got this error with update.php from D5 to D6.

PHP Warning: Unknown column 'serialized' in 'field list' query: SELECT data, created, headers, expire, serialized FROM cache_page WHERE cid = 'http://localhost/drupal6/update.php?' in C:\Inetpub\wwwroot\drupal6\includes\database.mysql.inc on line 163