test_maxfd — failing with py27

FAIL: test_maxfd (circus.tests.test_circusd.TestCircusd)
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Traceback (most recent call last):
  File "/home/rhubscher/git/circus/circus/tests/test_circusd.py", line 89, in test_maxfd
    self.assertTrue(isinstance(max, int))
AssertionError: False is not true