diff --git a/scripts/cert_renew.sh b/scripts/cert_renew.sh
index 77b5e9b..9a4d3da 100755
--- a/scripts/cert_renew.sh
+++ b/scripts/cert_renew.sh
@@ -6,7 +6,7 @@ cd "$(dirname "$(realpath "$0")")/../"
 lego \
 	--path ./data/.lego \
 	--email="acme@base23.de" \
-	--domains="sso.base23.de"
+	--domains="sso.base23.de" \
 	--http.webroot="./data/nginx/acme" \
 	--http renew \
 	--renew-hook="./scripts/cert_renew_hook.sh"