diff --git a/neutron/tests/unit/db/test_ipam_pluggable_backend.py b/neutron/tests/unit/db/test_ipam_pluggable_backend.py
index 8254bdb7289..abd0f7d1438 100644
--- a/neutron/tests/unit/db/test_ipam_pluggable_backend.py
+++ b/neutron/tests/unit/db/test_ipam_pluggable_backend.py
@@ -76,7 +76,7 @@ class TestDbBasePluginIpam(test_db_base.NeutronDbPluginV2TestCase):
             'subnet': mock.Mock(),
             'subnets': mock.Mock(),
             'port': {
-                'device_owner': n_const.DEVICE_OWNER_COMPUTE_PREFIX + 'None'
+                'device_owner': constants.DEVICE_OWNER_COMPUTE_PREFIX + 'None'
             },
             'subnet_request': ipam_req.SpecificSubnetRequest(
                 self.tenant_id,