diff --git a/src/assets/js/sound.js b/src/assets/js/sound.js
index b66ed20b..c10947eb 100644
--- a/src/assets/js/sound.js
+++ b/src/assets/js/sound.js
@@ -42,6 +42,7 @@ function audioMp3(mp3List) {
   mp3.auto_play = false
   mp3.loop = false
   mp3.Play = function () {
+    num = 0
     if (this.mp3List[0]) {
       sourceElement.src = getBlob(this.mp3List[0])
       sourceElement.type = "audio/mpeg"