diff --git a/src/ui/flutter/lib/l10n/intl_en.arb b/src/ui/flutter/lib/l10n/intl_en.arb
index 2a6df895..f82d44d4 100644
--- a/src/ui/flutter/lib/l10n/intl_en.arb
+++ b/src/ui/flutter/lib/l10n/intl_en.arb
@@ -1,4 +1,5 @@
 {
+  "@@locale": "en",
   "appName": "Mill Game",
   "@appName": {
     "description": "The App name"
diff --git a/src/ui/flutter/lib/l10n/intl_zh.arb b/src/ui/flutter/lib/l10n/intl_zh.arb
index 12b708c6..35d9eecd 100644
--- a/src/ui/flutter/lib/l10n/intl_zh.arb
+++ b/src/ui/flutter/lib/l10n/intl_zh.arb
@@ -1,4 +1,5 @@
 {
+  "@@locale": "zh",
   "appName": "直棋",
   "humanVsAi": "人机对战",
   "humanVsHuman": "双人对战",