diff --git a/lib/carto/tree/quoted.js b/lib/carto/tree/quoted.js
index 51dddb5..d159681 100644
--- a/lib/carto/tree/quoted.js
+++ b/lib/carto/tree/quoted.js
@@ -7,7 +7,8 @@ tree.Quoted = function Quoted(content) {
 
 tree.Quoted.prototype = {
     toString: function(quotes) {
-        var xmlvalue = this.value.replace(/\'/g, ''');
+        var xmlvalue = this.value.replace(/&/g, '&');
+        xmlvalue = xmlvalue.replace(/\'/g, ''');
         return (quotes === true) ? "'" + xmlvalue + "'" : this.value;
     },