diff --git a/lib/common-node.js b/lib/common-node.js
index 7573367..f5d5417 100644
--- a/lib/common-node.js
+++ b/lib/common-node.js
@@ -56,7 +56,7 @@ exports.querystringStringify = function (obj) {
   var saved = querystring.escape
   querystring.escape = escape // global
   var ret = querystring.stringify(obj)
-  ret = ret.replace(/[\@\*\/\+]/g, function (char) {
+  ret = ret.replace(/[@\*\/\+]/g, function (char) {
     // `escape` doesn't encode the characters @*/+ so we do it manually
     return '%' + char.charCodeAt(0).toString(16).toUpperCase()
   })