wp_nav_menu exclude not working

Hi all,

I’m trying to exclude the checkout link from my navbar on this website: http://www.thenormalschool.com/graywhite

Here’s the code I’m using: <?php wp_nav_menu( array('fallback_cb' => 'gray_white_black_page_menu', 'menu' => 'primary', 'depth' => '3', 'theme_location' => 'primary', 'link_before' => '', 'link_after' => '', 'container' => false, 'exclude' => '86' ) ); ?>

Any idea why this isn’t working?