diff --git a/superset/security/manager.py b/superset/security/manager.py
index 8c95482f946da..d9206dfe4d374 100644
--- a/superset/security/manager.py
+++ b/superset/security/manager.py
@@ -239,7 +239,7 @@ def create_login_manager(self, app: Flask) -> LoginManager:
         lm.request_loader(self.request_loader)
         return lm
 
-    def request_loader(self, request: Request):
+    def request_loader(self, request: Request) -> Optional[User]:
         # pylint: disable=import-outside-toplevel
         from superset.extensions import feature_flag_manager