diff --git a/sanic/app.py b/sanic/app.py
index c1e437a029..f5bfbccff4 100644
--- a/sanic/app.py
+++ b/sanic/app.py
@@ -1064,7 +1064,7 @@ def run(
         ssl: Union[dict, SSLContext, None] = None,
         sock: Optional[socket] = None,
         workers: int = 1,
-        protocol: Type[Protocol] = None,
+        protocol: Optional[Type[Protocol]] = None,
         backlog: int = 100,
         stop_event: Any = None,
         register_sys_signals: bool = True,