diff --git a/vmware_nsxlib/tests/unit/v3/policy/test_resources.py b/vmware_nsxlib/tests/unit/v3/policy/test_resources.py
index 2f1afef1..6cf7815c 100644
--- a/vmware_nsxlib/tests/unit/v3/policy/test_resources.py
+++ b/vmware_nsxlib/tests/unit/v3/policy/test_resources.py
@@ -2647,6 +2647,11 @@ class TestPolicyTier1(NsxPolicyLibTestCase):
                 ipv6_ndra_profile_id=ndra_profile,
                 tenant=TEST_TENANT)
 
+            verify_def = core_defs.Tier1LocaleServiceDef(
+                tier1_id=tier1_id,
+                service_id=self.resourceApi._locale_service_id(tier1_id),
+                tenant=TEST_TENANT)
+
             expected_def = core_defs.Tier1InterfaceDef(
                 tier1_id=tier1_id,
                 service_id=self.resourceApi._locale_service_id(tier1_id),
@@ -2656,7 +2661,8 @@ class TestPolicyTier1(NsxPolicyLibTestCase):
                 ipv6_ndra_profile_id=ndra_profile,
                 tenant=TEST_TENANT)
 
-            self.assert_called_with_def(api_call, expected_def)
+            self.assert_called_with_def(api_call, verify_def)
+            self.assert_called_with_def(api_call, expected_def, 1)
 
     def test_remove_router_interface(self):
         tier1_id = '111'
diff --git a/vmware_nsxlib/v3/policy/core_resources.py b/vmware_nsxlib/v3/policy/core_resources.py
index f619cc82..0a2aa2dc 100644
--- a/vmware_nsxlib/v3/policy/core_resources.py
+++ b/vmware_nsxlib/v3/policy/core_resources.py
@@ -940,6 +940,14 @@ class NsxPolicyTier1Api(NsxPolicyResourceBase):
         # with the same id as the router id with a constant suffix
         return tier1_id + self.LOCALE_SERVICE_SUFF
 
+    def _ensure_locale_service(self, tier1_id,
+                               tenant=constants.POLICY_INFRA_TENANT):
+        t1service_def = core_defs.Tier1LocaleServiceDef(
+            tier1_id=tier1_id,
+            service_id=self._locale_service_id(tier1_id),
+            tenant=tenant)
+        self.policy_api.create_or_update(t1service_def)
+
     def set_edge_cluster_path(self, tier1_id, edge_cluster_path,
                               tenant=constants.POLICY_INFRA_TENANT):
         t1service_def = core_defs.Tier1LocaleServiceDef(
@@ -972,6 +980,8 @@ class NsxPolicyTier1Api(NsxPolicyResourceBase):
     def add_segment_interface(self, tier1_id, interface_id, segment_id,
                               subnets, ipv6_ndra_profile_id=IGNORE,
                               tenant=constants.POLICY_INFRA_TENANT):
+        self._ensure_locale_service(tier1_id, tenant)
+
         t1interface_def = core_defs.Tier1InterfaceDef(
             tier1_id=tier1_id,
             service_id=self._locale_service_id(tier1_id),