Load error when working with ActiveSupport::Concern

gistfile1.txt

# app/models/something.rb
class Something < ActiveRecord::Base
  ...
end

# app/models/example.rb
class Example < ActiveRecord::Base
  include Something # (I get the error here)

  ...
end

# app/models/example/something.rb
module Example::Something
  extend ActiveSupport::Concern

  ...
end

When runnig tests with zeus 
$ zeus test
'include': wrong argument type Class (expected Module) (TypeError)

changing Example::Something to anything else helps, but I don't like that solution, any ideas?