diff --git a/slowapi/extension.py b/slowapi/extension.py
index 451e0d2..b6b2dd3 100644
--- a/slowapi/extension.py
+++ b/slowapi/extension.py
@@ -573,7 +573,7 @@ class Limiter:
 
         _scope = scope if shared else None
 
-        def decorator(func: Callable[..., Response]) -> Callable[..., Response]:
+        def decorator(func: Callable[..., Response]):
             keyfunc = key_func or self._key_func
             name = f"{func.__module__}.{func.__name__}"
             dynamic_limit = None