diff --git a/src/utils/validate.js b/src/utils/validate.js
index 3d1e2c4..78d9034 100644
--- a/src/utils/validate.js
+++ b/src/utils/validate.js
@@ -12,7 +12,7 @@ export function isEmail(s) {
  * @param {*} s
  */
 export function isPhone(s) {
-	return /^([0-9]{3,4}-)?[0-9]{7,8}$/.test(s)
+	return /^([0-9]{3,4}-)[0-9]{7,8}$/.test(s)
 }
 
 /**