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diff --git a/pytz/tests/test_tzinfo.py b/pytz/tests/test_tzinfo.py
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index b2640a8..4f5322b 100644
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--- a/pytz/tests/test_tzinfo.py
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+++ b/pytz/tests/test_tzinfo.py
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@@ -155,6 +155,7 @@ class PicklingTest(unittest.TestCase):
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             self._roundtrip_tzinfo(localized_tz)
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             self._roundtrip_datetime(dt.replace(tzinfo=localized_tz))
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+    @unittest.skip('Fails with system-wide timezone database')
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     def testRoundtrip(self):
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         for zone in pytz.all_timezones:
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             tz = pytz.timezone(zone)