diff --git a/src/enc-base64url.js b/src/enc-base64url.js
index 661ea39..83da289 100644
--- a/src/enc-base64url.js
+++ b/src/enc-base64url.js
@@ -24,7 +24,7 @@
          *
          *     var base64String = CryptoJS.enc.Base64url.stringify(wordArray);
          */
-        stringify: function (wordArray, urlSafe=true) {
+        stringify: function (wordArray, urlSafe) {
             // Shortcuts
             var words = wordArray.words;
             var sigBytes = wordArray.sigBytes;
@@ -73,7 +73,7 @@
          *
          *     var wordArray = CryptoJS.enc.Base64url.parse(base64String);
          */
-        parse: function (base64Str, urlSafe=true) {
+        parse: function (base64Str, urlSafe) {
             // Shortcuts
             var base64StrLength = base64Str.length;
             var map = urlSafe ? this._safe_map : this._map;