Cannot control wp_nav_menu properly

Question

I'm having a little issue which looks like a bug but probably isn't. Here we go:

I simply have this:

<?php wp_nav_menu( array('theme_location' => 'primary', 'container' => false, 'menu_class' => 'nav')); ?>

Now, my issue is that I expect my output to be:

<ul class="nav">
    <li>My link</li>
</ul>

instead I'm getting:

<div class="nav">
    <ul>
       <li>My Link</li>
    </ul>
</div>

I can't assign my nav class to the ul. How do I do that?

Many thanks!

Answer 1

As toscho pointed out the container argument should be left out or set to an empty string, and a menu should be created and assigned to the menu location (primary in this example).