diff --git a/front_end/web_audio/WebAudioView.js b/front_end/web_audio/WebAudioView.js
index ba324a4..8f42cf6 100644
--- a/front_end/web_audio/WebAudioView.js
+++ b/front_end/web_audio/WebAudioView.js
@@ -18,7 +18,7 @@
   constructor() {
     super(true, 1000);
     this.element.classList.add('web-audio-drawer');
-    this.registerRequiredCSS('web_audio/webAudio.css');
+    this.registerRequiredCSS('web_audio/webAudio.css', {enableLegacyPatching: true});
 
     // Creates the toolbar.
     const toolbarContainer = this.contentElement.createChild('div', 'web-audio-toolbar-container vbox');