Comment author url is not in a link

When I checked the source of my webpage, I saw the link of the website of the author is displayed like this :

<cite id="dsq-cite-xxx">
                http://url.com
        <span ...>Author name</span>
</cite>

I changed the “comment_author_url” function call by “get_comment_author_url” and it seems to work properly. My comment header is now :

<cite id="dsq-cite-XXX">
                <a href="http://url.com" rel="nofollow">Author name</a>
</cite>

I already solved my problem, but I wanted to share the solution with you.

http://wordpress.org/extend/plugins/disqus-comment-system/