my travis consistently fail on this but i can't repro locally

ChangedIntegrationTest.test_changed_with_changes_since_transitive 
                     
                     self = <pants_test.engine.legacy.test_changed_integration.ChangedIntegrationTest testMethod=test_changed_with_changes_since_transitive>
                     
                         def test_changed_with_changes_since_transitive(self):
                     >     self.assert_changed_new_equals_old(['--changes-since=HEAD^^', '--include-dependees=transitive'])
                     
                     tests/python/pants_test/engine/legacy/test_changed_integration.py:147: 
                     _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
                     tests/python/pants_test/engine/legacy/test_changed_integration.py:123: in assert_changed_new_equals_old
                         lines_to_set(changed_run.stdout_data), lines_to_set(engine_changed_run.stdout_data)
                     E   AssertionError: Items in the first set but not the second:
                     E   u'testprojects/src/java/org/pantsbuild/testproject/unicode/cucumber:cucumber-java-unstable-forced-1'
                     E   u'testprojects/src/java/org/pantsbuild/testproject/runtime:gson-unstable-runtime-1'
                     E   u'testprojects/src/java/org/pantsbuild/testproject/runtime:gson-unstable-compile-2'
                     E   u'testprojects/src/java/org/pantsbuild/testproject/runtime:gson-unstable-compile-3'
                     E   Items in the second set but not the first:
                     E   u'testprojects/src/java/org/pantsbuild/testproject/runtime:gson-unstable-runtime-7'
                     E   u'testprojects/src/java/org/pantsbuild/testproject/runtime:gson-unstable-compile-5'
                     E   u'testprojects/src/java/org/pantsbuild/testproject/runtime:gson-unstable-compile-6'
                     E   u'testprojects/src/java/org/pantsbuild/testproject/unicode/cucumber:cucumber-java-unstable-forced-3'