Rspec failing with load_missing_constant when classes live in subdirectories and are subclassed

I'm having some troubles running a bunch of RSpec tests due to something I suspect is related to autoloading. Here is the error:

/usr/share/ruby-rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.1.4/lib/active_support/dependencies.rb:490:in `load_missing_constant': Expected /var/lib/jenkins/.../portfolios/base_manage_controller.rb to define Portfolios::BaseManageController (LoadError)
from /usr/share/ruby-rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.1.4/lib/active_support/dependencies.rb:181:in `block in const_missing'
from /usr/share/ruby-rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.1.4/lib/active_support/dependencies.rb:179:in `each'
from /usr/share/ruby-rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.1.4/lib/active_support/dependencies.rb:179:in `const_missing'
from /usr/share/ruby-rvm/gems/ruby-1.9.2-p320@global/gems/rake-0.9.2.2/lib/rake/ext/module.rb:36:in `const_missing'
from /var/lib/jenkins/jobs/.../app/controllers/portfolios/customize_controller.rb:1:in `<top (required)>'

Here is the header of the file:

class Portfolios::BaseManageController < ApplicationController

And it lives in app/controllers/portfolios/base_manage_controller.rb

And its subclass:

class Portfolios::CustomizeController < Portfolios::BaseManageController

And it lives in app/controllers/portfolios/customize_controller.rb

Finally here are a bunch of autoloads:

config.autoload_paths += Dir["#{config.root}/lib",  "#{config.root}/lib/**/"]
config.autoload_paths += %W(#{config.root}/app/models/statistics)

#Any test/dev specific load paths
if not Rails.env.production?
  config.autoload_paths += %W(#{config.root}/spec/support)
  config.autoload_paths += %W(#{config.root}/spec/support/builders)
  config.autoload_paths += %W(#{config.root}/spec/support/modules)
  config.autoload_paths += %W(#{config.root}/spec/support/utils)
end

Any help would be much appreciated!