diff --git a/examples/simple/wsgi_flask_app.py b/examples/simple/wsgi_flask_app.py
index cdbd750cc..bbde69137 100644
--- a/examples/simple/wsgi_flask_app.py
+++ b/examples/simple/wsgi_flask_app.py
@@ -13,11 +13,11 @@ app = Flask("proxapp")
 def hello_world() -> str:
     return 'Hello World!'
 
+
 addons = [
     # Host app at the magic domain "proxapp.local" on port 80. Requests to this
     # domain and port combination will now be routed to the WSGI app instance.
-	wsgiapp.WSGIApp(app, "proxapp.local", 80)
-    
+    wsgiapp.WSGIApp(app, "proxapp.local", 80)
     # SSL works too, but the magic domain needs to be resolvable from the mitmproxy machine due to mitmproxy's design.
     # mitmproxy will connect to said domain and use serve its certificate (unless --no-upstream-cert is set)
     # but won't send any data.