diff --git a/lib/polyfill/fullscreen.js b/lib/polyfill/fullscreen.js
index 47dfeb7c0d..19c4118ae9 100644
--- a/lib/polyfill/fullscreen.js
+++ b/lib/polyfill/fullscreen.js
@@ -49,7 +49,7 @@ shaka.polyfill.Fullscreen.install = function() {
                          proto.msExitFullscreen ||
                          proto.webkitExitFullscreen;
 
-  if (!document.fullscreenElement) {
+  if (!('fullscreenElement' in document)) {
     Object.defineProperty(document, 'fullscreenElement', {
       get: function() {
         return document.mozFullScreenElement ||