diff --git a/app/controllers/api/storage.php b/app/controllers/api/storage.php
index 47693dc35d..7bde96810c 100644
--- a/app/controllers/api/storage.php
+++ b/app/controllers/api/storage.php
@@ -596,7 +596,7 @@ App::post('/v1/storage/buckets/:bucketId/files')
         // Save to storage
         $size = $device->getFileSize($file['tmp_name']);
         $path = $device->getPath(\uniqid().'.'.\pathinfo($file['name'], PATHINFO_EXTENSION));
-        $path = $bucket->getId() . '/' . $path;
+        $path = $bucket->getId() . DIRECTORY_SEPARATOR . $path;
         
         if (!$device->upload($file['tmp_name'], $path)) { // TODO deprecate 'upload' and replace with 'move'
             throw new Exception('Failed moving file', 500);