diff --git a/setup.py b/setup.py
index caa37f16e..f773652af 100644
--- a/setup.py
+++ b/setup.py
@@ -119,6 +119,9 @@ install_requires = [
 
     # WebSocket library for twisted and asyncio
     "autobahn >= 19.5.2",
+
+    # Support for Python 3 transition
+    "future >= 0.18.2",
 ]
 
 setup_requires = [
diff --git a/src/allmydata/test/test_humanreadable.py b/src/allmydata/test/test_humanreadable.py
index ea1d9ce9f..7df6e2cf3 100644
--- a/src/allmydata/test/test_humanreadable.py
+++ b/src/allmydata/test/test_humanreadable.py
@@ -1,12 +1,17 @@
 """Tests for allmydata.util.humanreadable."""
+from __future__ import unicode_literals
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
 
+from future import standard_library
+standard_library.install_aliases()
+from builtins import *
 from twisted.trial import unittest
 
 from allmydata.util import humanreadable
 
 
-
-
 def foo(): pass # keep the line number constant
 
 
@@ -17,7 +22,7 @@ class NoArgumentException(Exception):
 class HumanReadable(unittest.TestCase):
     def test_repr(self):
         hr = humanreadable.hr
-        self.failUnlessEqual(hr(foo), "<foo() at test_humanreadable.py:10>")
+        self.failUnlessEqual(hr(foo), "<foo() at test_humanreadable.py:15>")
         self.failUnlessEqual(hr(self.test_repr),
                              "<bound method HumanReadable.test_repr of <allmydata.test.test_humanreadable.HumanReadable testMethod=test_repr>>")
         self.failUnlessEqual(hr(long(1)), "1")
@@ -37,7 +42,9 @@ class HumanReadable(unittest.TestCase):
         except Exception as e:
             self.failUnless(
                 hr(e) == "<ValueError: 'oops'>" # python-2.4
-                or hr(e) == "ValueError('oops',)") # python-2.5
+                or hr(e) == "ValueError('oops',)" # python-2.5
+                or hr(e) == "ValueError(u'oops',)" # python 2 during py3 transition
+            )
         try:
             raise NoArgumentException
         except Exception as e: