diff --git a/src/wuttjamaican/cli/base.py b/src/wuttjamaican/cli/base.py
index 9a67768..e91c485 100644
--- a/src/wuttjamaican/cli/base.py
+++ b/src/wuttjamaican/cli/base.py
@@ -62,7 +62,7 @@ def make_cli_config(ctx: typer.Context):
     return make_config(files=ctx.params.get("config_paths") or None)
 
 
-def typer_callback(
+def typer_callback(  # pylint: disable=unused-argument
     ctx: typer.Context,
     config_paths: Annotated[
         Optional[List[Path]],
@@ -73,7 +73,14 @@ def typer_callback(
             help="Config path (may be specified more than once)",
         ),
     ] = None,
-):  # pylint: disable=unused-argument
+    runas_username: Annotated[
+        str,
+        typer.Option(
+            "--runas",
+            help="Username responsible for running the command (where applicable).",
+        ),
+    ] = None,
+):
     """
     Generic callback for use with top-level commands.  This adds some
     top-level args: