Overriding parent template part in child theme

I’m trying to override a part of my header.php (in the parent theme) in a child theme. I’m calling the template part in the header with

<?php get_template_part( 'navcontact' ); ?>

I thought if I had navcontact.php in the child theme, it would override the parent, but it doesn’t seem to be working.

Do I need to do anything else? Or something else?

It’s my own custom theme.