rainborick - 2:38 am on Apr 3, 2013 (gmt 0)
Well, that's not really all you can do. You can add a rel="canonical" tag to the page, which would generally resolve the issue, or you could set up a 301 redirect. Then just use Webmaster Tools to do a Fetch As Googlebot, followed by a submit.
Google is pretty good at detecting and eventually correcting this issue on its own. But these corrective steps do speed up the process.