diff --git a/scripts/upgrade b/scripts/upgrade
index 45829be..963ec6d 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -37,7 +37,7 @@ elif [ -n "${expose_port_53:-}" ] || [ "${expose_port_53:-}" = false ]; then
 	ynh_app_setting_set --app="$app" --key=expose_port_53 --value="$expose_port_53"
 fi
 
-if [ -z "${dns_over_https:-}" ] && [ "${dns_over_https:-}" = true ]; then
+if [ -z "${dns_over_https:-}" ] || [ "${dns_over_https:-}" = true ]; then
 	dns_over_https="true"
 	ynh_app_setting_set --app="$app" --key=dns_over_https --value=$dns_over_https
 elif [ -n "${dns_over_https:-}" ] || [ "${dns_over_https:-}" = false ]; then