diff --git a/src/index.js b/src/index.js
index 928ac14..9734cd6 100644
--- a/src/index.js
+++ b/src/index.js
@@ -47,7 +47,7 @@ if (typeof AudioWorkletNode !== 'function') {
     return scriptProcessor;
   };
 
-  Object.defineProperty(AudioContext.prototype, 'audioWorklet', {
+  Object.defineProperty((window.AudioContext||webkitAudioContext).prototype, 'audioWorklet', {
     get () {
       return this.$$audioWorklet || (this.$$audioWorklet = new window.AudioWorklet(this));
     }