diff --git a/powerline/shell.py b/powerline/shell.py
index 9de81c17..9d7d114c 100644
--- a/powerline/shell.py
+++ b/powerline/shell.py
@@ -54,7 +54,7 @@ def get_argparser(parser=None, *args, **kwargs):
 	p.add_argument('-c', '--config', metavar='KEY.KEY=VALUE', action='append')
 	p.add_argument('-t', '--theme_option', metavar='THEME.KEY.KEY=VALUE', action='append')
 	p.add_argument('-p', '--config_path', metavar='PATH')
-	p.add_argument('-R', '--renderer_arg', metavar='KEY="VAL"', action='append')
+	p.add_argument('-R', '--renderer_arg', metavar='KEY=VAL', action='append')
 	return p