diff --git a/Merger.js b/Merger.js
index 7c65b34..1b91c99 100644
--- a/Merger.js
+++ b/Merger.js
@@ -381,7 +381,13 @@
      * Create a standard SVG icon
      */
     MergerCore.prototype.mkIcon = function (color, text) {
-        return "data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 128 128' version='1.1'><circle cx='64' cy='64' r='62' id='c' style='fill:" + color + ";fill-opacity:1' /><text text-anchor='middle' alignment-baseline='alphabetic' style='font-weight:bold;font-size:90px;font-family:sans-serif;fill:#ffffff;stroke:none;' x='64' y='95'>" + text + "</text></svg>";
+        var svg = "<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 128 128' version='1.1'><circle cx='64' cy='64' r='62' id='c' style='fill:" + color + ";fill-opacity:1' /><text text-anchor='middle' alignment-baseline='alphabetic' style='font-weight:bold;font-size:90px;font-family:sans-serif;fill:#ffffff;stroke:none;' x='64' y='95'>" + text + "</text></svg>";
+        function b64EncodeUnicode(str) {
+            return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function (match, p1) {
+                return String.fromCharCode('0x' + p1);
+            }));
+        }
+        return "data:image/svg+xml;base64," + b64EncodeUnicode(svg);
     }
 
     /**