diff --git a/scripts/make_html_manual_page.py b/scripts/make_html_manual_page.py
index 52a76aaa..41d76e52 100644
--- a/scripts/make_html_manual_page.py
+++ b/scripts/make_html_manual_page.py
@@ -252,7 +252,6 @@ if __name__ == "__main__":
)
parser.add_argument(
"--no-css",
- type=bool,
help="don't prepend