diff --git a/src/get-assets.js b/src/get-assets.js
index a969b8db..06e3f0a8 100644
--- a/src/get-assets.js
+++ b/src/get-assets.js
@@ -42,7 +42,7 @@ async function getFiles (
   */
   for (const folder of folders) {
     files.push(
-      ...(await getFiles(path.join(dir, folder.name), urlPrefix, true))
+      ...(await getFiles(path.join(dir, folder.name), path.join(urlPrefix, folder.name), true))
     )
   }