diff --git a/lib/javascript-static.js b/lib/javascript-static.js
index df36acd83d5..48ccc641045 100644
--- a/lib/javascript-static.js
+++ b/lib/javascript-static.js
@@ -817,7 +817,9 @@ M.util.js_watch_io();
  * @return boolean - True if there is any pending js.
  */
 M.util.js_complete = function(uniqid) {
-    var index = M.util.pending_js.indexOf(uniqid);
+    // Use the Y.Array.indexOf instead of the native because some older browsers do not support
+    // the native function. Y.Array polyfills the native function if it does not exist.
+    var index = Y.Array.indexOf(M.util.pending_js, uniqid);
     if (index >= 0) {
         M.util.complete_js.push(M.util.pending_js.splice(index, 1));
     }