diff --git a/quantum/tests/unit/test_debug_commands.py b/quantum/tests/unit/test_debug_commands.py
index 9e7f7f7ab5..0f5a4d340b 100644
--- a/quantum/tests/unit/test_debug_commands.py
+++ b/quantum/tests/unit/test_debug_commands.py
@@ -20,6 +20,7 @@ import socket
 import mock
 import unittest2 as unittest
 
+from quantum.agent.common import config
 from quantum.agent.linux import interface
 from quantum.debug import commands
 from quantum.debug.debug_agent import DEVICE_OWNER_PROBE, QuantumDebugAgent
@@ -37,7 +38,7 @@ class TestDebugCommands(unittest.TestCase):
         cfg.CONF.register_opts(QuantumDebugAgent.OPTS)
         cfg.CONF(args=[], project='quantum')
         cfg.CONF.set_override('use_namespaces', True)
-        cfg.CONF.root_helper = 'sudo'
+        config.register_root_helper(cfg.CONF)
 
         self.addCleanup(mock.patch.stopall)
         device_exists_p = mock.patch(
diff --git a/quantum/tests/unit/test_dhcp_agent.py b/quantum/tests/unit/test_dhcp_agent.py
index c763244f58..46cff19f37 100644
--- a/quantum/tests/unit/test_dhcp_agent.py
+++ b/quantum/tests/unit/test_dhcp_agent.py
@@ -23,6 +23,7 @@ import uuid
 import mock
 import unittest2 as unittest
 
+from quantum.agent.common import config
 from quantum.agent import dhcp_agent
 from quantum.agent.linux import interface
 from quantum.common import exceptions
@@ -254,7 +255,7 @@ class TestDhcpAgentEventHandler(unittest.TestCase):
         cfg.CONF.register_opts(dhcp_agent.DeviceManager.OPTS)
         cfg.CONF.set_override('interface_driver',
                               'quantum.agent.linux.interface.NullDriver')
-        cfg.CONF.root_helper = 'sudo'
+        config.register_root_helper(cfg.CONF)
         cfg.CONF.register_opts(dhcp_agent.DhcpAgent.OPTS)
         self.notification_p = mock.patch(
             'quantum.agent.rpc.NotificationDispatcher')
@@ -666,7 +667,7 @@ class TestDeviceManager(unittest.TestCase):
         cfg.CONF.register_opts(dhcp_agent.DhcpAgent.OPTS)
         cfg.CONF.set_override('interface_driver',
                               'quantum.agent.linux.interface.NullDriver')
-        cfg.CONF.root_helper = 'sudo'
+        config.register_root_helper(cfg.CONF)
 
         self.device_exists_p = mock.patch(
             'quantum.agent.linux.ip_lib.device_exists')