diff --git a/neutron_lbaas/tests/unit/common/cert_manager/test_local.py b/neutron_lbaas/tests/unit/common/cert_manager/test_local.py
index d0b1f65bb..5c61dbe99 100644
--- a/neutron_lbaas/tests/unit/common/cert_manager/test_local.py
+++ b/neutron_lbaas/tests/unit/common/cert_manager/test_local.py
@@ -65,7 +65,7 @@ class TestLocalManager(base.BaseTestCase):
     def _store_cert(self):
         file_mock = mock.mock_open()
         # Attempt to store the cert
-        with mock.patch('__builtin__.open', file_mock, create=True):
+        with mock.patch('six.moves.builtins.open', file_mock, create=True):
             cert_id = local_cert_manager.CertManager.store_cert(
                 certificate=self.certificate,
                 intermediates=self.intermediates,
@@ -97,7 +97,7 @@ class TestLocalManager(base.BaseTestCase):
     def _get_cert(self, cert_id):
         file_mock = mock.mock_open()
         # Attempt to retrieve the cert
-        with mock.patch('__builtin__.open', file_mock, create=True):
+        with mock.patch('six.moves.builtins.open', file_mock, create=True):
             data = local_cert_manager.CertManager.get_cert(cert_id)
 
         # Verify the correct files were opened
diff --git a/neutron_lbaas/tests/unit/drivers/haproxy/test_namespace_driver.py b/neutron_lbaas/tests/unit/drivers/haproxy/test_namespace_driver.py
index 92a47b270..07ae403b8 100644
--- a/neutron_lbaas/tests/unit/drivers/haproxy/test_namespace_driver.py
+++ b/neutron_lbaas/tests/unit/drivers/haproxy/test_namespace_driver.py
@@ -241,7 +241,7 @@ class TestHaproxyNSDriver(base.BaseTestCase):
     def test_update(self):
         self.driver._get_state_file_path = mock.Mock(return_value='/path')
         self.driver._spawn = mock.Mock()
-        with mock.patch('__builtin__.open') as m_open:
+        with mock.patch('six.moves.builtins.open') as m_open:
             file_mock = mock.MagicMock()
             m_open.return_value = file_mock
             file_mock.__enter__.return_value = file_mock
@@ -667,7 +667,7 @@ class TestNamespaceDriverModule(base.BaseTestCase):
     @mock.patch('neutron.agent.linux.utils.execute')
     def test_kill_pids_in_file(self, execute, exists):
         pid_path = '/var/lib/data'
-        with mock.patch('__builtin__.open') as m_open:
+        with mock.patch('six.moves.builtins.open') as m_open:
             exists.return_value = False
             file_mock = mock.MagicMock()
             m_open.return_value = file_mock
diff --git a/neutron_lbaas/tests/unit/drivers/haproxy/test_synchronous_driver.py b/neutron_lbaas/tests/unit/drivers/haproxy/test_synchronous_driver.py
index a343a71fd..68eafba65 100644
--- a/neutron_lbaas/tests/unit/drivers/haproxy/test_synchronous_driver.py
+++ b/neutron_lbaas/tests/unit/drivers/haproxy/test_synchronous_driver.py
@@ -20,6 +20,7 @@ import mock
 from neutron.common import exceptions
 from neutron.extensions import portbindings
 from neutron.plugins.common import constants
+import six
 
 from neutron_lbaas.db.loadbalancer import models
 from neutron_lbaas.drivers.haproxy \
@@ -78,7 +79,7 @@ class TestHaproxyNSDriver(base.BaseTestCase):
             rdb.asert_called_once_with(dirs)
             upin.assert_has_calls([mock.call(lbs[0]), mock.call(lbs[1])])
             self.assertEqual(2, upin.call_count)
-            #deployed_loadbalancer_ids is a set
+            # deployed_loadbalancer_ids is a set
             self.assertEqual(1, len(self.driver.deployed_loadbalancer_ids))
             self.assertIn(self._sample_in_loadbalancer().id,
                           self.driver.deployed_loadbalancer_ids)
@@ -514,7 +515,7 @@ class TestHaproxyNSDriver(base.BaseTestCase):
         with contextlib.nested(
             mock.patch.object(self.driver, '_get_state_file_path'),
             mock.patch.object(self.driver, '_spawn'),
-            mock.patch('__builtin__.open')
+            mock.patch.object(six.moves.builtins, 'open')
         ) as (gsp, spawn, mock_open):
             mock_open.return_value = ['5']
 
@@ -650,7 +651,7 @@ class TestHaproxyNSDriver(base.BaseTestCase):
     def test_kill_pids_in_file(self):
         with contextlib.nested(
             mock.patch('os.path.exists'),
-            mock.patch('__builtin__.open'),
+            mock.patch.object(six.moves.builtins, 'open'),
             mock.patch('neutron.agent.linux.utils.execute'),
             mock.patch.object(namespace_driver.LOG, 'exception'),
         ) as (path_exists, mock_open, mock_execute, mock_log):
diff --git a/neutron_lbaas/tests/unit/services/loadbalancer/drivers/haproxy/test_namespace_driver.py b/neutron_lbaas/tests/unit/services/loadbalancer/drivers/haproxy/test_namespace_driver.py
index c6328c0ac..c1050eebb 100644
--- a/neutron_lbaas/tests/unit/services/loadbalancer/drivers/haproxy/test_namespace_driver.py
+++ b/neutron_lbaas/tests/unit/services/loadbalancer/drivers/haproxy/test_namespace_driver.py
@@ -16,6 +16,7 @@ import contextlib
 
 import mock
 from neutron.common import exceptions
+import six
 
 from neutron_lbaas.services.loadbalancer.drivers.haproxy \
     import namespace_driver
@@ -73,7 +74,7 @@ class TestHaproxyNSDriver(base.BaseTestCase):
         with contextlib.nested(
             mock.patch.object(self.driver, '_get_state_file_path'),
             mock.patch.object(self.driver, '_spawn'),
-            mock.patch('__builtin__.open')
+            mock.patch.object(six.moves.builtins, 'open')
         ) as (gsp, spawn, mock_open):
             mock_open.return_value = ['5']
 
@@ -410,7 +411,7 @@ class TestHaproxyNSDriver(base.BaseTestCase):
     def test_kill_pids_in_file(self):
         with contextlib.nested(
             mock.patch('os.path.exists'),
-            mock.patch('__builtin__.open'),
+            mock.patch.object(six.moves.builtins, 'open'),
             mock.patch('neutron.agent.linux.utils.execute'),
             mock.patch.object(namespace_driver.LOG, 'exception'),
         ) as (path_exists, mock_open, mock_execute, mock_log):