diff --git a/neutron/tests/unit/extensions/test_l3.py b/neutron/tests/unit/extensions/test_l3.py
index 2cb6fb06d18..18ab5a6e8a6 100644
--- a/neutron/tests/unit/extensions/test_l3.py
+++ b/neutron/tests/unit/extensions/test_l3.py
@@ -3144,7 +3144,7 @@ class L3NatTestCaseBase(L3NatTestCaseMixin):
             l3_models.RouterPort.router_id,
             models_v2.IPAllocation.ip_address
         ).join(
-            models_v2.Port, models_v2.IPAllocation
+            l3_models.RouterPort.port, models_v2.Port.fixed_ips
         ).filter(
             models_v2.Port.network_id == internal_port['network_id'],
             l3_models.RouterPort.port_type.in_(