diff --git a/src/core/operations/URLEncode.mjs b/src/core/operations/URLEncode.mjs
index 9ea9f365..99eec91d 100644
--- a/src/core/operations/URLEncode.mjs
+++ b/src/core/operations/URLEncode.mjs
@@ -52,7 +52,7 @@ class URLEncode extends Operation {
     encodeBytes(bytes, encodeAll) {
         const safeChars = encodeAll ?
             /^[A-Za-z0-9]$/ :
-            /^[A-Za-z0-9:/?#\[\]@!$&'\(\)*+,;=%]$/;
+            /^[A-Za-z0-9:/?#[\]@!$&'()*+,;=%]$/;
 
         let output = "";