diff --git a/i18n-tool.js b/i18n-tool.js
index 7de7acc..91025c4 100644
--- a/i18n-tool.js
+++ b/i18n-tool.js
@@ -2,7 +2,7 @@ module.exports = {
   validate_phone ({ phone, format } = {}) {
     try {
       if (typeof format === 'string') {
-        return new RegExp(format).test(callnumber)
+        return new RegExp(format).test(phone)
       }
     } catch (exp) {
       console.log('Invalid phone format: ', format)