diff --git a/openstack/tests/unit/cloud/test_task_manager.py b/openstack/tests/unit/cloud/test_task_manager.py
index fd8907199..89fc2dfce 100644
--- a/openstack/tests/unit/cloud/test_task_manager.py
+++ b/openstack/tests/unit/cloud/test_task_manager.py
@@ -78,8 +78,8 @@ class TestRateTransforms(base.TestCase):
                 'compute': 20,
                 'network': 10,
             })
-        self.assertEqual(1 / 20, manager._get_wait('compute'))
-        self.assertEqual(1 / 10, manager._get_wait('network'))
+        self.assertEqual(1.0 / 20, manager._get_wait('compute'))
+        self.assertEqual(1.0 / 10, manager._get_wait('network'))
         self.assertIsNone(manager._get_wait('object-store'))
 
 
diff --git a/openstack/tests/unit/test_connection.py b/openstack/tests/unit/test_connection.py
index 84e54b37b..936b11b01 100644
--- a/openstack/tests/unit/test_connection.py
+++ b/openstack/tests/unit/test_connection.py
@@ -93,8 +93,8 @@ class TestConnection(base.TestCase):
 
     def test_task_manager_rate_scalar(self):
         conn = connection.Connection(cloud='sample-cloud', rate_limit=20)
-        self.assertEqual(1 / 20, conn.task_manager._get_wait('object-store'))
-        self.assertEqual(1 / 20, conn.task_manager._get_wait(None))
+        self.assertEqual(1.0 / 20, conn.task_manager._get_wait('object-store'))
+        self.assertEqual(1.0 / 20, conn.task_manager._get_wait(None))
 
     def test_task_manager_rate_dict(self):
         conn = connection.Connection(
@@ -103,8 +103,8 @@ class TestConnection(base.TestCase):
                 'compute': 20,
                 'network': 10,
             })
-        self.assertEqual(1 / 20, conn.task_manager._get_wait('compute'))
-        self.assertEqual(1 / 10, conn.task_manager._get_wait('network'))
+        self.assertEqual(1.0 / 20, conn.task_manager._get_wait('compute'))
+        self.assertEqual(1.0 / 10, conn.task_manager._get_wait('network'))
         self.assertIsNone(conn.task_manager._get_wait('object-store'))
 
     def test_create_session(self):
diff --git a/tox.ini b/tox.ini
index c6d500e53..ad02bfe85 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,8 @@
 [tox]
-minversion = 2.0
+minversion = 3.1
 envlist = py35,py36,py27,pep8
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
 usedevelop = True