pre_get_posts for cpt

<?php
// Include custom post type in default category archives
// Ref link: http://wordpress.org/support/topic/custom-post-type-tagscategories-archive-page
add_filter('pre_get_posts', 'query_post_type');
function query_post_type($query) {
  if( is_category() || is_tag() || is_home() && empty( $query->query_vars['suppress_filters'] ) ) {
    $post_type = get_query_var('post_type');
    $post_type = array('post','adverts','nav_menu_item'); // replace cpt to your custom post type
    $query->set('post_type',$post_type);
    return $query;
    }
}
?>