_wp_unfiltered_html_comment and XHTML 1.0

I have validation (XHTML 1.0) warning here:

<input type="hidden" id="_wp_unfiltered_html_comment" name="_wp_unfiltered_html_comment" value="70f6a179db" />

Warning: “An ID attribute does not conform with the HTML document type specification. ID tokens must begin with a letter, and may contain only letters, digits, hyphens, underscores, colons, and periods”.

This ID is generated by WordPress engine, so what I can do?