destroy_user_session doesn't work in Devise

Question

I'm using rails 3.1.3 and devise 1.5.3 and when I add destroy_user_session_path to my layout file, the link doesn't work. I can login just fine, but when I click this path I get this error:

No route matches [GET] "/users/sign_out"

BUT, if I run rake routes, I see this route listed:

destroy_user_session DELETE /users/sign_out(.:format)
{:action=>"destroy", :controller=>"devise/sessions"}

So the route clearly uses the DELETE verb. I can get the path to work by adding :method => :delete, but why do I have to do that? The route is there and configured to be a delete already, so what's up?