How do I path relative CSS paths correctly when using Visual Studio 2012 Bundling?

I have an MVC 3 / .NET 4.0 application running on Visual Studio 2012.

I just created a static bundle for all my JS and CSS files.

It first squawked at me for using paths without "~/" at the beginning, but I need to include files that are in another virtual directory on my server, so I used /../ to get them.

My bundle looks like this:

Bundle css = new Bundle("~/MyCSS", typeof(CssMinify));
css.AddFile("~/Content/css/Site.min.css");   
css.AddFile("~/../CommonWeb/css/fontawesome/css/font-awesome.css");   
BundleTable.Bundles.Add(css);

I'm trying to include font-awesome. It finds the CSS file just fine, but none of the fonts and icons are coming in. I'm guessing it is lines like this that cause the problem:

src: url('../font/fontawesome-webfont.eot');  /* From Font-Awesome */

Any thoughts on how to fix this? Thanks!

EDIT: More information:

When looking at the request for a relative CSS path, it goes after the root of my server:

http://localhost/font/fontawesome-webfont.woff

Instead of

http://localhost/CommonWeb/css/fontawesome/font/fontawesome-webfont.woff