diff --git a/tests/integration/test_integration_all_rust.py b/tests/integration/test_integration_all_rust.py
index 5b85ade0c..85f6ff761 100644
--- a/tests/integration/test_integration_all_rust.py
+++ b/tests/integration/test_integration_all_rust.py
@@ -426,7 +426,7 @@ def setup_mock_server():
     global MOCK_SERVER_THREAD
 
     MOCK_SERVER_THREAD = Thread(
-        target=run_fastapi_app, kwargs=dict(host="localhost", port=MOCK_SERVER_PORT)
+        target=run_fastapi_app, kwargs=dict(host="127.0.0.1", port=MOCK_SERVER_PORT)
     )
     MOCK_SERVER_THREAD.daemon = True
     MOCK_SERVER_THREAD.start()
@@ -1419,7 +1419,7 @@ async def quick_register(self, connection_port=None):
         await client.connect()
         await client.hello()
         await client.register()
-        returnValue(client)
+        return client
 
     @pytest.mark.asyncio
     async def shut_down(self, client=None):