diff --git a/luci-app-xray/fw4/root/usr/share/xray/gen_config.uc b/luci-app-xray/fw4/root/usr/share/xray/gen_config.uc
index 7ba50a6c6..cd1f7d62a 100644
--- a/luci-app-xray/fw4/root/usr/share/xray/gen_config.uc
+++ b/luci-app-xray/fw4/root/usr/share/xray/gen_config.uc
@@ -694,6 +694,7 @@ function dns_conf() {
             address: fast_dns_object["address"],
             port: fast_dns_object["port"],
             domains: [...upstream_domain_names(), ...fast_domain_rules()],
+            skipFallback: true,
         },
     ];