diff --git a/alexa-api/server.js b/alexa-api/server.js
index c16e785..636b147 100644
--- a/alexa-api/server.js
+++ b/alexa-api/server.js
@@ -136,7 +136,7 @@ app.post('/speak', async function(req, res) {
           deviceType: target.deviceType,
           deviceSerialNumber: target.serialNumber,
           customerId: customerId,
-          locale: 'ja-JP',
+          locale: '',
           textToSpeak: text,
         },
       },