diff --git a/lib/polyfill/mediasource.js b/lib/polyfill/mediasource.js
index ecd30c6e7a..ec30a699a8 100644
--- a/lib/polyfill/mediasource.js
+++ b/lib/polyfill/mediasource.js
@@ -208,6 +208,12 @@ shaka.polyfill.MediaSource = class {
   static patchVp09_() {
     const originalIsTypeSupported = MediaSource.isTypeSupported;
 
+    if (shaka.util.Platform.isWebOS()) {
+      // Don't do this on LG webOS as otherwise it is unable
+      // to play vp09 at all.
+      return;
+    }
+
     MediaSource.isTypeSupported = (mimeType) => {
       // Split the MIME type into its various parameters.
       const pieces = mimeType.split(/ *; */);