Bootstrap: Dropdown as wide as the image

I want to make a localisation dropdown with "flag images" under Laravel 5.4. I achieved it, but the dropdown is much wider than the images. How to configure it if I want to be the dropdown as wide as the images?

My snippet:

<li class="dropdown">
    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">
        <img src="/img/flags/.png" alt="Logo"></a>
    </a>
    <ul class="dropdown-menu" role="menu">
        <li><a href=""><img src="/img/flags/hu.png"></a></li>
        <li><a href=""><img src="/img/flags/en.png"></a></li>
    </ul>
</li>

Update:

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