diff --git a/src/entry/app.js b/src/entry/app.js
index a7e50f1..d9d715e 100644
--- a/src/entry/app.js
+++ b/src/entry/app.js
@@ -226,7 +226,7 @@ function inappInterfaceGuide () {
             currentButton.className = 'interface-button';
             currentButton = target.parentNode;
             currentButton.className = currentButton.className + ' interface-button-selected';
-            ScratchAudio.sndFXWithVolume('keydown.wav', 0.3);
+            window.parent.ScratchAudio.sndFXWithVolume('keydown.wav', 0.3);
         }
     };
     document.addEventListener('touchstart', switchHelp, false);
@@ -276,7 +276,7 @@ function inappPaintEditorGuide () {
             currentButton.className = 'paint-button';
             currentButton = target.parentNode;
             currentButton.className = currentButton.className + ' paint-button-selected';
-            ScratchAudio.sndFXWithVolume('keydown.wav', 0.3);
+            window.parent.ScratchAudio.sndFXWithVolume('keydown.wav', 0.3);
         }
     };
     document.addEventListener('touchstart', switchHelp, false);
diff --git a/src/utils/ScratchAudio.js b/src/utils/ScratchAudio.js
index b17a0e6..754a838 100755
--- a/src/utils/ScratchAudio.js
+++ b/src/utils/ScratchAudio.js
@@ -183,4 +183,6 @@ export default class ScratchAudio {
     }
 }
 
+window.ScratchAudio = ScratchAudio;
+
 window.addEventListener('touchend', ScratchAudio.firstOnTouchEnd, false);