diff --git a/django-stubs/middleware/csrf.pyi b/django-stubs/middleware/csrf.pyi
index abfde51..9819321 100644
--- a/django-stubs/middleware/csrf.pyi
+++ b/django-stubs/middleware/csrf.pyi
@@ -22,7 +22,7 @@ def rotate_token(request: HttpRequest) -> None: ...
 class CsrfViewMiddleware(MiddlewareMixin):
     def process_request(self, request: HttpRequest) -> None: ...
     def process_view(
-        self, request: HttpRequest, callback: Callable, callback_args: Tuple, callback_kwargs: Dict[str, Any]
+        self, request: HttpRequest, callback: Optional[Callable], callback_args: Tuple, callback_kwargs: Dict[str, Any]
     ) -> Optional[HttpResponseForbidden]: ...
     def process_response(self, request: HttpRequest, response: HttpResponseBase) -> HttpResponseBase: ...