diff --git a/lib/polyfill/media_capabilities.js b/lib/polyfill/media_capabilities.js
index e2080ca9b5..a97d02d37d 100644
--- a/lib/polyfill/media_capabilities.js
+++ b/lib/polyfill/media_capabilities.js
@@ -8,6 +8,7 @@ goog.provide('shaka.polyfill.MediaCapabilities');
 
 goog.require('shaka.log');
 goog.require('shaka.polyfill');
+goog.require('shaka.util.Platform');
 
 
 /**
@@ -22,7 +23,10 @@ shaka.polyfill.MediaCapabilities = class {
   static install() {
     shaka.log.debug('MediaCapabilities: install');
 
-    if (navigator.mediaCapabilities) {
+    // Since MediaCapabilities is not fully supported on Chromecast yet, we
+    // should always install polyfill for Chromecast.
+    // TODO: re-evaluate MediaCapabilities in the future versions of Chromecast.
+    if (!shaka.util.Platform.isChromecast() && navigator.mediaCapabilities) {
       shaka.log.debug(
           'MediaCapabilities: Native mediaCapabilities support found.');
       return;