Custom Post Type Archives URL is rewriting to main post URL

I’ve created a custom post type called testimonials, and the testimonials page rewrite works fine. However, the posts that are published are rewriting to the main post URL rewrite. For example:

All my blog posts are like this:

http://mydomain.com/blog/2011/02/post-name

And the loop feeds them through http://mydomain.com/blog/, which is what I want.

However, my testimonials are done like this:

http://mydomain.com/testimonials/

But the individual posts are pulling the rewrite from the main posts, like this:

http://mydomain.com/blog/testimonials/post-name/

How can I fix this so that the /blog/ doesn’t appear in the testimonials URL?

Thanks!