diff --git a/js/join.js b/js/join.js
index e2c66839..acddf6b6 100644
--- a/js/join.js
+++ b/js/join.js
@@ -1,10 +1,4 @@
 $(document).ready( function () {
-    jQuery.validator.addMethod("minwidth", function(value, element, params) {
-        return this.optional(element) || mb_strwidth(value) >= params;
-    }, "글자 너비가 알파벳 {0} 자보다 길어야합니다");
-    jQuery.validator.addMethod("maxwidth", function(value, element, params) {
-        return this.optional(element) || mb_strwidth(value) <= params;
-    }, "글자 너비가 알파벳 {0} 자보다 짧아야합니다");
     $( "#main_form" ).validate( {
         rules: {
             username: {
@@ -34,7 +28,7 @@ $(document).ready( function () {
             },
             nickname:{
                 required: true,
-                maxwidth: 18,
+                maxlength: 9,
                 remote: {
                     url: "j_check_dup.php",
                     type: "post",