Passenger + .htaccess

On domains where I’m using passenger / mod_rails to run a rails application, setting simple access controls with .htaccess/.htpasswd does not accomplish anything: passenger seems to subvert the process and the site does not ask for a username/password login.

Is there a way to restore this functionality, short of abandoning mod_rails entirely and just going back to the old-fashioned fcgi way of doing things? I am building a site that the client wants kept under password authentication during the entire build/demo process.

Thanks mucho!