diff --git a/tempest/api/network/base_routers.py b/tempest/api/network/base_routers.py
index 6d4e756..62062ba 100644
--- a/tempest/api/network/base_routers.py
+++ b/tempest/api/network/base_routers.py
@@ -45,8 +45,3 @@
         body = self.routers_client.remove_router_interface(router_id,
                                                            subnet_id=subnet_id)
         self.assertEqual(subnet_id, body['subnet_id'])
-
-    def _remove_router_interface_with_port_id(self, router_id, port_id):
-        body = self.routers_client.remove_router_interface(router_id,
-                                                           port_id=port_id)
-        self.assertEqual(port_id, body['port_id'])
diff --git a/tempest/api/network/test_routers.py b/tempest/api/network/test_routers.py
index 97ad4d4..ee0e395 100644
--- a/tempest/api/network/test_routers.py
+++ b/tempest/api/network/test_routers.py
@@ -153,8 +153,8 @@
         interface = self.routers_client.add_router_interface(
             router['id'],
             port_id=port_body['port']['id'])
-        self.addCleanup(self._remove_router_interface_with_port_id,
-                        router['id'], port_body['port']['id'])
+        self.addCleanup(self.routers_client.remove_router_interface,
+                        router['id'], port_id=port_body['port']['id'])
         self.assertIn('subnet_id', interface.keys())
         self.assertIn('port_id', interface.keys())
         # Verify router id is equal to device id in port details