How to disable deletion of user with ID 1

Hi to the whole Drupal community.

Is there a way to prevent a "administer users"-enabled role from deleting the admin account -- namely, user with ID 1?

In other words;
I need to give to a specific user (or to a specific role) enough rights to add and delete users.
I do so by enabling the "administer users" option for that role in the Permissions page.
Suddenly, that role can delete the admin user.

How can I prevent this?

Thanks in advance
--
unwiredbrain