diff --git a/src/allmydata/test/mutable/test_problems.py b/src/allmydata/test/mutable/test_problems.py
index 02fb62ac4..86a367596 100644
--- a/src/allmydata/test/mutable/test_problems.py
+++ b/src/allmydata/test/mutable/test_problems.py
@@ -1,4 +1,14 @@
+"""
+Ported to Python 3.
+"""
 from __future__ import print_function
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import unicode_literals
+
+from future.utils import PY2
+if PY2:
+    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
 
 import os, base64
 from twisted.trial import unittest
diff --git a/src/allmydata/util/_python3.py b/src/allmydata/util/_python3.py
index dba0006e8..a794bf991 100644
--- a/src/allmydata/util/_python3.py
+++ b/src/allmydata/util/_python3.py
@@ -104,6 +104,7 @@ PORTED_TEST_MODULES = [
     "allmydata.test.mutable.test_interoperability",
     "allmydata.test.mutable.test_multiple_encodings",
     "allmydata.test.mutable.test_multiple_versions",
+    "allmydata.test.mutable.test_problems",
     "allmydata.test.test_abbreviate",
     "allmydata.test.test_base32",
     "allmydata.test.test_base62",