W3C validation – Whitespace in query component

I think I am getting thrown this error on W3C because the description in the URL is plain text with spaces. It does not look correct for pinterest either (http://developers.pinterest.com/pin_it/)

Line 406
$appended_url = ‘?url=’.rawurlencode($link).’&media=’.rawurlencode($media).’&description=’.strip_tags($title);

throws out this in the URL:
description=Next stop: Pinterest

Should it be:
description=Next%20stop%3A%20Pinterest

Thanks!

http://wordpress.org/plugins/really-simple-facebook-twitter-share-buttons/