posts_per_page & pagination conflict

I have a custom query to display my custom post type. posts_per_page set to ‘5’. In admin post per page set to ’10’ (settings => Reading => Blog pages show at most 10 posts)
My template lists 5 posts per page. If I have 15 posts it must be shown in 3 pages, but on third page I get 404 error. So my pagination uses the admin settings (10 posts per page). How can I fix it?

global $paged;
query_posts(array(
    'post_type' => 'custom_post_type',
    'posts_per_page' => 5,
    'orderby' => 'title',
    'order' => 'ASC',
    'paged' => $paged
    ));

while (have_posts()) : the_post();
    the_title();
endwhile;

next_posts_link('Next');
previous_posts_link('Prev');

Answers:

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Method 1

Pagination is calculated before you get to the template file that runs query_posts. The proper way to alter posts_per_page conditionally is to use the pre_get_posts hook to modify the main query.

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