diff --git a/src/phone/validator.ts b/src/phone/validator.ts
index 60fd43b..daa0ef3 100644
--- a/src/phone/validator.ts
+++ b/src/phone/validator.ts
@@ -1,5 +1,5 @@
 import { AbstractControl, Validators, ValidatorFn } from '@angular/forms';
-import { isValidNumber } from 'libphonenumber-js';
+import { isValidNumber, CountryCode } from 'libphonenumber-js';
 
 import { isPresent } from '../util/lang';
 
@@ -7,8 +7,6 @@ export const phone = (country: string): ValidatorFn => {
   return (control: AbstractControl): { [key: string]: boolean } => {
     if (isPresent(Validators.required(control))) return null;
 
-    let v: string = control.value;
-
-    return isValidNumber({phone: v, country}) ? null : {phone: true};
+    return isValidNumber(control.value, country as CountryCode) ? null : {phone: true};
   };
 };