non-www to www in Multisite Domain Mapping makes a Redirect Loop


I have my site,, set as the non-www format with the Domain Mapping Plugin, and it works great. My problem is, I need to switch it to the www format (for SEO/backlinks). I deleted that domain, and re-added it as It allowed me to do that fine, but when I tried to visit the site it gives me an error that it is stuck in a redirect. I cleared my cache and cookies. All my other sites in my multisite are set as the www version and they work fine. Also, my .htaccess file is the default wordpress multisite file.

Thanks for your help.