diff --git a/src/extensions/scratch3_speech/index.js b/src/extensions/scratch3_speech/index.js
index 873c10032..a1ce64f60 100644
--- a/src/extensions/scratch3_speech/index.js
+++ b/src/extensions/scratch3_speech/index.js
@@ -196,12 +196,12 @@ class Scratch3SpeechBlocks {
      * @private
      */
     _loadUISounds () {
-        const startSoundBuffer = assetData['speech-rec-start.mp3'].buffer;
+        const startSoundBuffer = assetData['speech-rec-start.mp3'];
         this._decodeSound(startSoundBuffer).then(buffer => {
             this._startSoundBuffer = buffer;
         });
 
-        const endSoundBuffer = assetData['speech-rec-end.mp3'].buffer;
+        const endSoundBuffer = assetData['speech-rec-end.mp3'];
         this._decodeSound(endSoundBuffer).then(buffer => {
             this._endSoundBuffer = buffer;
         });
diff --git a/src/extensions/scratch3_speech/manifest.js b/src/extensions/scratch3_speech/manifest.js
index e5ce54d59..cb76b3ac0 100644
--- a/src/extensions/scratch3_speech/manifest.js
+++ b/src/extensions/scratch3_speech/manifest.js
@@ -1,4 +1,4 @@
 module.exports = {
-    'speech-rec-start.mp3': require('!buffer-loader!./assets/speech-rec-start.mp3'),
-    'speech-rec-end.mp3': require('!buffer-loader!./assets/speech-rec-end.mp3')
+    'speech-rec-start.mp3': require('!arraybuffer-loader!./assets/speech-rec-start.mp3'),
+    'speech-rec-end.mp3': require('!arraybuffer-loader!./assets/speech-rec-end.mp3')
 };