diff --git a/tests/middleware/test_proxy_headers.py b/tests/middleware/test_proxy_headers.py
index 435809b90..5af3a58fc 100644
--- a/tests/middleware/test_proxy_headers.py
+++ b/tests/middleware/test_proxy_headers.py
@@ -432,7 +432,7 @@ async def test_proxy_headers_multiple_proxies(trusted_hosts: str | list[str], ex
         (True, "1234", 1234),
         (False, "1234", 0),
         (False, "443", 0),
-    ]
+    ],
 )
 async def test_proxy_headers_with_forwarded_port(forwarded_port, port, expected) -> None:
     async with make_httpx_client("*", forwarded_port=forwarded_port) as client:
diff --git a/uvicorn/config.py b/uvicorn/config.py
index d28f94e65..4a1d13d79 100644
--- a/uvicorn/config.py
+++ b/uvicorn/config.py
@@ -470,7 +470,9 @@ def load(self) -> None:
         if logger.getEffectiveLevel() <= TRACE_LOG_LEVEL:
             self.loaded_app = MessageLoggerMiddleware(self.loaded_app)
         if self.proxy_headers:
-            self.loaded_app = ProxyHeadersMiddleware(self.loaded_app, trusted_hosts=self.forwarded_allow_ips, forwarded_port=self.forwarded_port)
+            self.loaded_app = ProxyHeadersMiddleware(
+                self.loaded_app, trusted_hosts=self.forwarded_allow_ips, forwarded_port=self.forwarded_port
+            )
 
         self.loaded = True
 
diff --git a/uvicorn/middleware/proxy_headers.py b/uvicorn/middleware/proxy_headers.py
index 6c4938635..84b2f56ae 100644
--- a/uvicorn/middleware/proxy_headers.py
+++ b/uvicorn/middleware/proxy_headers.py
@@ -20,8 +20,9 @@ class ProxyHeadersMiddleware:
     - <https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For>
     """
 
-    def __init__(self, app: ASGI3Application, trusted_hosts: list[str] | str = "127.0.0.1",
-                 forwarded_port: bool = False) -> None:
+    def __init__(
+        self, app: ASGI3Application, trusted_hosts: list[str] | str = "127.0.0.1", forwarded_port: bool = False
+    ) -> None:
         self.app = app
         self.trusted_hosts = _TrustedHosts(trusted_hosts)
         self.forwarded_port = forwarded_port