diff --git a/mayacontrol.js b/mayacontrol.js
index ab0903d..712a2e6 100644
--- a/mayacontrol.js
+++ b/mayacontrol.js
@@ -100,7 +100,7 @@ app.post('/setting', (req, res) => {
             ['mic', 'hiz', 'line', 'mic_hiz', 'mute'].includes(value) ||
             Number.isInteger(value)
         ) ||
-        !/[a-zA-Z]/.test(setting)
+        !/^[a-zA-Z]+$/.test(setting)
     ) {
         return res.status(400).send();
     }
diff --git a/package.json b/package.json
index 89deac8..7e3d355 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "maya22-web-control",
-    "version": "1.3.3",
+    "version": "1.3.4",
     "description": "Control ESI Maya 22",
     "main": "mayacontrol.js",
     "scripts": {