diff --git a/src/js/lib/class.js b/src/js/lib/class.js
index a70724b..0210605 100644
--- a/src/js/lib/class.js
+++ b/src/js/lib/class.js
@@ -38,7 +38,7 @@ exports.remove = function (element, className) {
 
 exports.list = function (element) {
   if (element.classList) {
-    return element.classList;
+    return Array.prototype.slice.apply(element.classList);
   } else {
     return element.className.split(' ');
   }