image path isn't being set by config.ru file

[corroded]

I've tried setting the image path using this in config.ru:

use Rack::CommonLogger
use Rack::Static,
  :urls => ['/stylesheets', '/javascripts', '/images', '/favicon.ico'], :root => 'public'

but it still looks for article images in:

127.0.0.1 - - [28/Sep/2011 23:03:18] "GET /img/articles/2011/august/ozma.png HTTP/1.1" 404 142 0.0019

[corroded]

i see in the gem that it is actually hardcoded:

def full_image_path
  return nil unless self[:image]
  self[:date].strftime("/img/articles/%Y/%B/#{self[:image]}").downcase
end