WordPress:Fix 404 error Custom Post Type category pagination

<?php
/**
 * This plugin will fix a 404 error when viewing a paginated category listing of
 * a custom post type when the custom permalink string is /%category%/%postname%/
 * The problem is the request only checks for items with the 'post' type
 * To fix the problem, add custom post types to the request
 */
function fix_category_pagination($qs){
    if(isset($qs['category_name']) && isset($qs['paged'])){
        $qs['post_type'] = get_post_types($args = array(
            'public'   => true,
            '_builtin' => false
        ));
        array_push($qs['post_type'],'post');
    }
    return $qs;
}
add_filter('request', 'fix_category_pagination');
?>