EntityManager::refresh fails when ID columnName differs from fieldName

/**
 * @Entity
 * @Table(name="site")
 */
class Site
{
    /**
     * @Id
     * @Column(type="integer", name="site_id")
     * @GeneratedValue
     */
    protected $id;

    /** @Column(type="string",length=45, unique=true) */
    protected $name;

    public function __construct($name = '')
    {
        $this->name = $name;
    }
}

$site = new Site('Foo');
$em->persist($site);
$em->flush();
$em->refresh($site);

Doctrine\ORM\ORMException: Unrecognized field: site_id

/Users/hobodave/dev/work/doctrine2/lib/Doctrine/ORM/ORMException.php:45
/Users/hobodave/dev/work/doctrine2/lib/Doctrine/ORM/Persisters/BasicEntityPersister.php:1042
/Users/hobodave/dev/work/doctrine2/lib/Doctrine/ORM/Persisters/BasicEntityPersister.php:783
/Users/hobodave/dev/work/doctrine2/lib/Doctrine/ORM/Persisters/BasicEntityPersister.php:571
/Users/hobodave/dev/work/doctrine2/lib/Doctrine/ORM/UnitOfWork.php:1485
/Users/hobodave/dev/work/doctrine2/lib/Doctrine/ORM/UnitOfWork.php:1461
/Users/hobodave/dev/work/doctrine2/lib/Doctrine/ORM/EntityManager.php:431
/Users/hobodave/dev/work/S5/tests/application/modules/common/services/SiteServiceTest.php:69