diff --git a/deploy/auto-install.sh b/deploy/auto-install.sh
index 356b79ef..742b4abb 100755
--- a/deploy/auto-install.sh
+++ b/deploy/auto-install.sh
@@ -148,8 +148,8 @@ setup_docker_openwisp() {
 		# VPN domain
 		if [[ -z "$vpn_domain" ]]; then
 			set_env "VPN_DOMAIN" "openvpn.${domain}"
-		elif [[ "${vpn_domain,,}" == "n" ]]; then
-			set_env "VPN_DOMAIN" "example.com"
+		elif [[ "$vpn_domain" == "n" || "$vpn_domain" == "N" ]]; then
+			set_env "VPN_DOMAIN" ""
 		else
 			set_env "VPN_DOMAIN" "$vpn_domain"
 		fi