diff --git a/nixos/service.nix b/nixos/service.nix
index af1c068..9df44c5 100644
--- a/nixos/service.nix
+++ b/nixos/service.nix
@@ -41,6 +41,7 @@ in
         FFMPEG_PATH = "${cfg.ffmpeg-package}/bin/ffmpeg";
         FFPROBE_PATH = "${cfg.ffmpeg-package}/bin/ffprobe";
         FONTCONFIG_PATH = cfg.quotly-fonts;
+        IPV6 = "1";
       };
       serviceConfig = {
         User = "q2tg";
diff --git a/src/client/Telegram.ts b/src/client/Telegram.ts
index e37277d..2012888 100644
--- a/src/client/Telegram.ts
+++ b/src/client/Telegram.ts
@@ -46,7 +46,7 @@ export default class Telegram {
         langCode: 'zh',
         deviceModel: `${appName} On ${os.hostname()}`,
         appVersion: 'rainbowcat',
-        useIPV6: true,
+        useIPV6: !!process.env.IPV6,
         proxy: process.env.PROXY_IP ? {
           socksType: 5,
           ip: process.env.PROXY_IP,