diff --git a/setup-scripts/letsencrypt-setup.sh b/setup-scripts/letsencrypt-setup.sh
index 49487ae8..a6b8f030 100755
--- a/setup-scripts/letsencrypt-setup.sh
+++ b/setup-scripts/letsencrypt-setup.sh
@@ -1,5 +1,11 @@
 #! /usr/bin/env bash
 set -e
 
-sudo certbot --nginx -d siasky.net -d www.siasky.net
+domain="$1"
+if [[ -z $domain ]]; then
+  echo "Usage $0 DOMAIN_NAME"
+  exit 1
+fi
+
+sudo certbot --nginx -d "$domain" -d www."$domain"
 sudo certbot renew --dry-run