diff --git a/pos_tare/static/src/js/models.js b/pos_tare/static/src/js/models.js
index 4388d131..e335919f 100644
--- a/pos_tare/static/src/js/models.js
+++ b/pos_tare/static/src/js/models.js
@@ -15,8 +15,8 @@ odoo.define('pos_tare.models', function (require) {
         }
     }
 
+    _NumpadState_: models.NumpadState.prototype;
     var NumpadState = models.NumpadState.extend({
-      _NumpadState_: models.NumpadState.prototype;
       appendNewChar: function (newChar) {
             try {
                 _NumpadState_.appendNewChar.call(this, newChar);