diff --git a/io/serialport/locales/ja/25-serial.json b/io/serialport/locales/ja/25-serial.json
index 0b65a851..979c07b2 100644
--- a/io/serialport/locales/ja/25-serial.json
+++ b/io/serialport/locales/ja/25-serial.json
@@ -11,7 +11,7 @@
             "split": "入力の分割方法",
             "deliver": "分割後の配信データ",
             "output": "出力",
-            "serial": "シリアル",
+            "serial": "serial",
             "none": "なし"
         },
         "placeholder": {