diff --git a/src/python/jw/pkg/lib/App.py b/src/python/jw/pkg/lib/App.py
index a778f73c..704d5394 100644
--- a/src/python/jw/pkg/lib/App.py
+++ b/src/python/jw/pkg/lib/App.py
@@ -6,7 +6,9 @@ import os
 import sys
 import warnings
 
-from argparse import ArgumentDefaultsHelpFormatter, ArgumentParser, Namespace
+from argparse import (
+    ArgumentDefaultsHelpFormatter, ArgumentParser, Namespace, _SubParsersAction
+)
 from typing import TYPE_CHECKING, Any, NamedTuple, cast, override
 
 from .AsyncRunner import AsyncRunner
@@ -151,21 +153,20 @@ class App:  # export
 
     def _build_parser(self, argv: list[str] | None = None) -> None:
 
-        def add_cmd_to_parser(cmd: AbstractCmd, parsers: Any) -> ArgumentParser:
-            parser = cast(
-                'ArgumentParser',
-                parsers.add_parser(
-                    cmd.name,
-                    help = cmd.help,
-                    description = cmd.description,
-                    aliases = cmd.aliases,
-                    formatter_class = ArgumentDefaultsHelpFormatter,
-                )
+        def make_sub_parser(
+            cmd: AbstractCmd, parsers: _SubParsersAction[ArgumentParser]
+        ) -> ArgumentParser:
+            ret = parsers.add_parser(
+                cmd.name,
+                help = cmd.help,
+                description = cmd.description,
+                aliases = cmd.aliases,
+                formatter_class = ArgumentDefaultsHelpFormatter,
             )
-            parser.set_defaults(func = cmd.run)
-            cmd.add_arguments(parser)
-            cmd.set_parser(parser)
-            return parser
+            ret.set_defaults(func = cmd.run)
+            cmd.add_arguments(ret)
+            cmd.set_parser(ret)
+            return ret
 
         def add_cmds_to_parser(
             parent: AbstractCmd | App,
@@ -187,7 +188,7 @@ class App:  # export
                 cmd.set_parent(parent)
                 if cmd.name in scs:
                     log(WARNING, f'Duplicate subcommand name: {cmd.name}')
-                scs[cmd.name] = _SubCommand(cmd, add_cmd_to_parser(cmd, subparsers))
+                scs[cmd.name] = _SubCommand(cmd, make_sub_parser(cmd, subparsers))
                 for alias in cmd.aliases:
                     if alias != cmd.name and alias in scs:
                         log(