Rails - Jul 2012 - app-prefix for tasks defined in an engine?!

I have defined a rake task inside an engine like this: 

rake app:redmine_config:spec

namespace :my_engine do 
  
  desc "say foo"
  task :foo do
    puts "foo from the engine"
  end

end

I expected the task to be available under

rake my_engine:foo

instead I found it under: 

rake app:my_engine:foo

Does anybody have an idea where the prefix comes from? Can I change it? Can 
I get rid of it?

thx for any help, 
stefan


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