diff --git a/cue/tests/functional/base.py b/cue/tests/functional/base.py
index 2963dd78..4fa6224a 100644
--- a/cue/tests/functional/base.py
+++ b/cue/tests/functional/base.py
@@ -131,7 +131,7 @@ class FunctionalTestCase(base.BaseTestCase):
     def flags(self, group=None, **kw):
         """Override flag variables for a test."""
         for k, v in six.iteritems(kw):
-            CONF.set_override(k, v, group)
+            CONF.set_override(k, v, group, enforce_type=True)
 
     def path_get(self, project_file=None):
         """Get the absolute path to a file. Used for testing the API.
diff --git a/cue/tests/functional/db/manage/database/test_migration.py b/cue/tests/functional/db/manage/database/test_migration.py
index 57516e9e..7d514ab3 100644
--- a/cue/tests/functional/db/manage/database/test_migration.py
+++ b/cue/tests/functional/db/manage/database/test_migration.py
@@ -40,7 +40,8 @@ class MigrationFunctionalTests(base.BaseTestCase):
         self.config = self.config_fixture.config
         self.config_fixture.register_opt(cfg.StrOpt(
             'connection', default='sqlite://'))
-        conf.set_override('connection', 'sqlite://', 'database')
+        conf.set_override('connection', 'sqlite://', 'database',
+                          enforce_type=True)
 
         self.cmd = database.DatabaseCommands()
 
diff --git a/cue/tests/functional/monitor/test_monitor.py b/cue/tests/functional/monitor/test_monitor.py
index 339dd360..2702bf15 100644
--- a/cue/tests/functional/monitor/test_monitor.py
+++ b/cue/tests/functional/monitor/test_monitor.py
@@ -37,9 +37,12 @@ class MonitorFunctionalTests(base.FunctionalTestCase):
     def setUp(self):
         super(MonitorFunctionalTests, self).setUp()
 
-        CONF.set_override("coord_url", "zake", group="taskflow")
-        CONF.set_override("zk_hosts", "", group="taskflow")
-        CONF.set_override("zk_port", "", group="taskflow")
+        CONF.set_override("coord_url", "zake", group="taskflow",
+                          enforce_type=True)
+        CONF.set_override("zk_hosts", "", group="taskflow",
+                          enforce_type=True)
+        CONF.set_override("zk_port", "", group="taskflow",
+                          enforce_type=True)
 
         self.test_uuid_1 = uuid.uuid4()
         self.test_uuid_2 = uuid.uuid4()
diff --git a/cue/tests/unit/manage/database/test_migration.py b/cue/tests/unit/manage/database/test_migration.py
index cb9290ff..e9ddd8d8 100644
--- a/cue/tests/unit/manage/database/test_migration.py
+++ b/cue/tests/unit/manage/database/test_migration.py
@@ -33,7 +33,8 @@ class TestMigration(oslo_base.BaseTestCase):
     def setUp(self):
         super(TestMigration, self).setUp()
 
-        CONF.set_override("connection", "sqlite://", group="database")
+        CONF.set_override("connection", "sqlite://", group="database",
+                          enforce_type=True)
         self.cue_manage_database = cue_db.DatabaseCommands()
 
     @mock.patch('oslo_db.sqlalchemy.migration_cli.manager.'
diff --git a/cue/tests/unit/monitor/test_monitor.py b/cue/tests/unit/monitor/test_monitor.py
index dbcd2b97..50f546f8 100644
--- a/cue/tests/unit/monitor/test_monitor.py
+++ b/cue/tests/unit/monitor/test_monitor.py
@@ -33,9 +33,12 @@ class TestMonitorService(oslo_base.BaseTestCase):
     def setUp(self):
         super(TestMonitorService, self).setUp()
 
-        CONF.set_override("coord_url", "zake", group="taskflow")
-        CONF.set_override("zk_hosts", "", group="taskflow")
-        CONF.set_override("zk_port", "", group="taskflow")
+        CONF.set_override("coord_url", "zake", group="taskflow",
+                          enforce_type=True)
+        CONF.set_override("zk_hosts", "", group="taskflow",
+                          enforce_type=True)
+        CONF.set_override("zk_port", "", group="taskflow",
+                          enforce_type=True)
 
         self.cue_monitor_service = cue_monitor_service.MonitorService()
 
@@ -45,7 +48,8 @@ class TestMonitorService(oslo_base.BaseTestCase):
                    mock_fixed_interval_loop_call_start,
                    mock_loop_call_wait):
         CONF.set_override("loop_interval_seconds", "9001",
-                          group="cue_monitor")
+                          group="cue_monitor",
+                          enforce_type=True)
 
         self.cue_monitor_service.start()