diff --git a/lib/prepare-file-list.js b/lib/prepare-file-list.js
index 4fa419f..5dd681e 100644
--- a/lib/prepare-file-list.js
+++ b/lib/prepare-file-list.js
@@ -116,7 +116,9 @@ function prepareFilesList(config) {
       // Check if the dir exists
       if (existsSync(directory)) {
         files.push(
-          ...glob.sync(path.join(directory, '**', `*.${fileExtensions[0]}`))
+          ...glob.sync(
+            path.posix.join(directory, '**', `*.${fileExtensions[0]}`)
+          )
         )
       } else {
         console.error(