diff --git a/tests/test_io.py b/tests/test_io.py
index 086ecab..8372caf 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -1,11 +1,10 @@
 from __future__ import absolute_import
 
-import unittest
-
 import fiona
 
 from geopandas import GeoDataFrame, read_postgis, read_file
 import tests.util
+from .util import unittest
 
 class TestIO(unittest.TestCase):
     def setUp(self):