sitemap.xml has incomplete element for tag archive pages

How do I get Infinite SEO to automatically add the protocol (http://) and domain name (example.com) in the <loc></loc> element of my sitemap.xml file for tag archive pages?

Currently, I'm getting <loc>/tag/tagname/</loc> instead of <loc>http://example.com/tag/tagname/</loc>.

It only works right if I manually enter a canonical url for each tag.