diff --git a/stdlib/types.pyi b/stdlib/types.pyi
index be11c8827..9b2fa1f4a 100644
--- a/stdlib/types.pyi
+++ b/stdlib/types.pyi
@@ -200,6 +200,7 @@ class FunctionType:
         @property
         def __builtins__(self) -> dict[str, Any]: ...
 
+    __module__: str
     def __init__(
         self,
         code: CodeType,