User as target of join fails

use strict;
use warnings;

use Test::More;
use Test::DBIx::Class {
  schema_class => 'Interchange6::Schema',
  traits       => 'Testpostgresql',
  resultsets   => [ qw/ Order User / ],
};

fixtures_ok [
    User => [
        [qw/username email password first_name last_name active/],
        [qw/[email protected] [email protected] password Example User 1/],
    ],
    Country => [
        [qw/country_iso_code/],
        [qw/US/],
    ],
    Address => [
        [qw/users_id country_iso_code/],
        [qw/1 US/],
    ],
    Order => [
        [qw/order_number order_date users_id shipping_addresses_id billing_addresses_id/],
        [qw/123 2014-01-01 1 1 1/],
    ],
], 'Installed fixtures';

my $rset = Schema->resultset('Order')->search(
    {},
    {
        prefetch => 'User',
    }
);
my $result = $rset->next;
done_testing;

DBIx::Class::Storage::DBI::_dbh_execute(): DBI Exception: DBD::Pg::st execute failed: ERROR:  syntax error at or near "."
LINE 1: ...dling, me.salestax, me.total_cost, me.status, User.users_id,...
                                                             ^ [for Statement "SELECT me.orders_id, me.order_number, me.order_date, me.users_id, me.email, me.shipping_addresses_id, me.billing_addresses_id, me.weight, me.payment_method, me.payment_number, me.payment_status, me.shipping_method, me.subtotal, me.shipping, me.handling, me.salestax, me.total_cost, me.status, User.users_id, User.username, User.nickname, User.email, User.password, User.first_name, User.last_name, User.last_login, User.created, User.last_modified, User.active FROM orders me  JOIN users User ON User.users_id = me.users_id"] at ic6_schema_user_issue.t line 36