diff --git a/scripts/rollup.config.js b/scripts/rollup.config.js
index 73d2ae467..55d9f32ba 100644
--- a/scripts/rollup.config.js
+++ b/scripts/rollup.config.js
@@ -75,6 +75,9 @@ export default [
     external: ['video.js'],
     plugins: umdPlugins
       .concat([uglify({
+        compress: {
+          typeofs: false
+        },
         output: {
           comments: 'some'
         }