diff --git a/app_skellington/cli.py b/app_skellington/cli.py
index 8b5be8a..3aebd1f 100644
--- a/app_skellington/cli.py
+++ b/app_skellington/cli.py
@@ -94,7 +94,7 @@ class CommandTree:
         ):
             if is_required:
                 _bootstrap_logger.warn('Unable to enforce required submenu: Requires >= Python 3.7')
-            del func_args[required]
+            del func_args['required']
 
         # Creates an argument as a slot in the underlying argparse.
         subparsers = self.root_parser.add_subparsers(