simple_form with Bootstrap check box

I'm using simple_form with Bootstrap and I would like to have my "Remember me" check box be inline to the left of the label, as in the Twitter Bootstrap docs: http://twitter.github.com/bootstrap/base-css.html#forms

My form code looks like this:

<%= simple_form_for(resource, :as => resource_name, :url => session_path(resource_name), :html => { :class => 'well'}) do |f| %>
    <%= f.input :email %>
    <%= f.input :password %>
    <%= f.input :remember_me, :as => :boolean if devise_mapping.rememberable?  %>

    <%= f.button :submit, "Sign In" %>

<% end %>

The result is the the "Remember me" label on top of a check box.

What have I messed up?