Can’t keep those loops separate

For some reason this is getting mixed up with the main loop and looping through ALL of the posts and not just one…

Any ideas?

$temp_query = $wp_query;
	$randposts = new WP_Query('posts_per_page=1&orderby=rand');
	if ( $randposts->have_posts() ) : while ( $randposts->have_posts() ) : $randposts->the_post(); 

<do stuff>

	endwhile; endif;
	$wp_query = $temp_query;