diff --git a/vmware_nsxlib/tests/unit/v3/policy/test_resources.py b/vmware_nsxlib/tests/unit/v3/policy/test_resources.py
index 2d4f4a03..02b679b9 100644
--- a/vmware_nsxlib/tests/unit/v3/policy/test_resources.py
+++ b/vmware_nsxlib/tests/unit/v3/policy/test_resources.py
@@ -2079,7 +2079,7 @@ class TestPolicyTier1(NsxPolicyLibTestCase):
             # make sure tier0 is in the body with value None
             actual_def = update_call.call_args_list[0][0][0]
             self.assertIn('tier0_path', actual_def.get_obj_dict())
-            self.assertEqual("", actual_def.get_obj_dict()['tier0_path'])
+            self.assertIsNone(actual_def.get_obj_dict()['tier0_path'])
 
     def test_update_route_adv(self):
         obj_id = '111'
diff --git a/vmware_nsxlib/v3/policy/core_defs.py b/vmware_nsxlib/v3/policy/core_defs.py
index f962e3fe..503b1dc7 100644
--- a/vmware_nsxlib/v3/policy/core_defs.py
+++ b/vmware_nsxlib/v3/policy/core_defs.py
@@ -354,7 +354,7 @@ class Tier1Def(RouterDef):
         # TODO(annak): replace with provider path when provider is exposed
         if self.has_attr('tier0'):
             tier0 = self.get_attr('tier0')
-            tier0_path = ""
+            tier0_path = None
             if tier0:
                 tenant = TENANTS_PATH_PATTERN % self.get_tenant()
                 tier0_path = "/%stier-0s/%s" % (tenant, tier0)