diff --git a/src/more-infos/more-info-alarm_control_panel.js b/src/more-infos/more-info-alarm_control_panel.js
index 5f455e46ed..faf720fdc7 100644
--- a/src/more-infos/more-info-alarm_control_panel.js
+++ b/src/more-infos/more-info-alarm_control_panel.js
@@ -51,7 +51,7 @@ export default new Polymer({
       computed: 'validateCode(enteredCode, codeFormat)',
     },
   },
-  validateCode: function(code, format) {
+  validateCode(code, format) {
     const re = new RegExp(format);
     if (format === null) {
       return true;