query_posts not updating $wp_query->found_posts

I am trying to modify wp_query within plugin to also include posts marked “private”:

if (have_posts()) {
global $wp_query;
query_posts(array_merge($wp_query->query, array(‘post_status’ => array(‘published’,’private’),’post_type’ => ‘post’)));

while (have_posts()) {
the_post();
…
}
}

but $wp_query->found_posts shows global $wp_query count not including merged arguments. What am I doing wrong?

Thanks!

P.S. I have checked theme’s functions – nothing to modify query_post there…