diff --git a/examples/miniapps/fastapi-simple/fastapi_di_example.py b/examples/miniapps/fastapi-simple/fastapi_di_example.py
index d6c3b1f1..9f3d3f83 100644
--- a/examples/miniapps/fastapi-simple/fastapi_di_example.py
+++ b/examples/miniapps/fastapi-simple/fastapi_di_example.py
@@ -1,13 +1,11 @@
-import sys
-
 from fastapi import FastAPI, Depends
 from dependency_injector import containers, providers
-from dependency_injector.wiring import inject, Provide
+from dependency_injector.wiring import Provide, inject
 
 
 class Service:
     async def process(self) -> str:
-        return 'Ok'
+        return "OK"
 
 
 class Container(containers.DeclarativeContainer):
@@ -18,12 +16,12 @@ class Container(containers.DeclarativeContainer):
 app = FastAPI()
 
 
-@app.api_route('/')
+@app.api_route("/")
 @inject
 async def index(service: Service = Depends(Provide[Container.service])):
     result = await service.process()
-    return {'result': result}
+    return {"result": result}
 
 
 container = Container()
-container.wire(modules=[sys.modules[__name__]])
+container.wire(modules=[__name__])
diff --git a/examples/miniapps/fastapi-simple/tests.py b/examples/miniapps/fastapi-simple/tests.py
index dc4f6203..d7bd7d1f 100644
--- a/examples/miniapps/fastapi-simple/tests.py
+++ b/examples/miniapps/fastapi-simple/tests.py
@@ -8,7 +8,7 @@ from fastapi_di_example import app, container, Service
 
 @pytest.fixture
 def client(event_loop):
-    client = AsyncClient(app=app, base_url='http://test')
+    client = AsyncClient(app=app, base_url="http://test")
     yield client
     event_loop.run_until_complete(client.aclose())
 
@@ -16,10 +16,10 @@ def client(event_loop):
 @pytest.mark.asyncio
 async def test_index(client):
     service_mock = mock.AsyncMock(spec=Service)
-    service_mock.process.return_value = 'Foo'
+    service_mock.process.return_value = "Foo"
 
     with container.service.override(service_mock):
-        response = await client.get('/')
+        response = await client.get("/")
 
     assert response.status_code == 200
-    assert response.json() == {'result': 'Foo'}
+    assert response.json() == {"result": "Foo"}