Custom post type permalink structure without post name

I have a CPT that is called city , in my permalink options panel i've set the permalink structure to /archives/%post_id% notice that there is no slug for post name.

but the permalink for the city post type is shown as archives/city/post_name.

what i need to do is to remove the post_name from the permalink structure and query it by post_id to be like archives/city/post_id