diff --git a/third_party/2and3/werkzeug/utils.pyi b/third_party/2and3/werkzeug/utils.pyi
index 18ec6622d..1f84d83e8 100644
--- a/third_party/2and3/werkzeug/utils.pyi
+++ b/third_party/2and3/werkzeug/utils.pyi
@@ -1,4 +1,4 @@
-from typing import Any, Optional, Type, TypeVar, overload
+from typing import Any, Optional, Text, Type, TypeVar, overload
 
 from werkzeug._internal import _DictAccessorProperty
 from werkzeug.wrappers import Response
@@ -29,7 +29,7 @@ xhtml: Any
 
 def get_content_type(mimetype, charset): ...
 def format_string(string, context): ...
-def secure_filename(filename): ...
+def secure_filename(filename: Text) -> Text: ...
 def escape(s, quote: Optional[Any] = ...): ...
 def unescape(s): ...