diff --git a/phaser/src/YouTubePlayables.js b/phaser/src/YouTubePlayables.js
index 439606d..4fbe2d4 100644
--- a/phaser/src/YouTubePlayables.js
+++ b/phaser/src/YouTubePlayables.js
@@ -330,7 +330,7 @@ export const YouTubePlayables = {
 
     unsetAudioChangeCallback: function ()
     {
-        if (this.__unsetAudioCallback)
+        if (this._unsetAudioCallback)
         {
             this._unsetAudioCallback();