How to keep a checkbox and label on the same line in a Rails form?

According to the bootstrap wiki, it must be

<label class="checkbox">
  <input type="checkbox"> Check me out
</label>

which in Ruby on Rails is

<%= f.label :terms_of_service do %>
  <%= f.check_box :terms_of_service %>
  I agree to the <%= link_to 'Terms of Service', policies_path %>.
<% end %>