diff --git a/src/lib/storage.js b/src/lib/storage.js
index b2094c118d93248e8a373d32947a60927d0be320..64269e3ede293c6e65c2a36cffc7b89f480d1b39 100644
--- a/src/lib/storage.js
+++ b/src/lib/storage.js
@@ -27,7 +27,7 @@ class Storage extends ScratchStorage {
         );
         this.addWebSource(
             [this.AssetType.Sound],
-            asset => `/static/extension-assets/scratch3_music/${asset.assetId}.${asset.dataFormat}`
+            asset => `static/extension-assets/scratch3_music/${asset.assetId}.${asset.dataFormat}`
         );
         defaultProjectAssets.forEach(asset => this.cache(
             this.AssetType[asset.assetType],