Minitap issue with puts in tested method

minitestissue.rb

require 'minitap'
MiniTest::Unit.runner = MiniTest::TapJ.new
require 'minitest/autorun'
require 'active_support/core_ext' # why do i have to require this?

class TestThis < MiniTest::Unit::TestCase

  def my_method
    puts "this will break tapout because of malformed output"
    true
  end

  def test_broken
    assert my_method
  end

end

output.json

{"type":"suite","start":"2011-12-27 14:08:46","count":1,"seed":12262,"rev":3}
{"type":"case","subtype":"","label":"TestThis","level":0}
this will break tapout because of malformed output
{"type":"test","subtype":"","status":"pass","label":"test_broken","time":0.000294929}
{"type":"final","time":0.000395902,"counts":{"total":1,"pass":1,"fail":0,"error":0,"omit":0,"todo":0}}