orderby=name not working in get_posts

Using get_posts, ordering by slug is listed as an option in the documentation by calling orderby=name, but this doesn’t seem to have any affect on the loop.

Is there another way you can order pages by slug instead of title or ID? I don’t see it as an option using query_posts. Any ideas?

Here’s the code I’m using:

<?php
global $post;
$pageID = $post->ID;
$myposts = get_posts('post_parent='.$pageID.'&numberposts=-1&post_type=page&orderby=name&order=ASC');
 foreach($myposts as $post) :
   setup_postdata($post);
?>

<div class="post column" id="post-<?php the_ID(); ?>">
<a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php
if ( has_post_thumbnail() ) {
	the_post_thumbnail( 'thumbnail' );
} else {
	postimage( 'thumbnail' );
}
?></a>
<h4 id="post-<?php the_ID(); ?>"><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h4>

<?php wp_link_pages(array('before' => '<p><strong>Pages:</strong> ', 'after' => '</p>', 'next_or_number' => 'number')); ?>

</div> <!-- /.post.column -->

<?php endforeach; ?>

Thanks!