diff --git a/src/node/utils/ExportHelper.js b/src/node/utils/ExportHelper.js
index e8d47fb2..99921aa3 100644
--- a/src/node/utils/ExportHelper.js
+++ b/src/node/utils/ExportHelper.js
@@ -77,7 +77,7 @@ exports._analyzeLine = function(text, aline, apool){
 
 
 exports._encodeWhitespace = function(s){
-  return s.replace(/[^\x21-\x7E\s\t\n\r]/g, function(c){
-    return "&#" +c.charCodeAt(0) + ";";
+  return s.replace(/[^\x21-\x7E\s\t\n\r]/gu, function(c){
+    return "&#" +c.codePointAt(0) + ";";
   });
 };