diff --git a/actions/attachment_thumbnail.php b/actions/attachment_thumbnail.php
index e8f89ffc36..d1f9f2d00c 100644
--- a/actions/attachment_thumbnail.php
+++ b/actions/attachment_thumbnail.php
@@ -59,7 +59,7 @@ class Attachment_thumbnailAction extends AttachmentAction
         try {
             $thumbnail = $this->attachment->getThumbnail($this->thumb_w, $this->thumb_h, $this->thumb_c);
         } catch (UseFileAsThumbnailException $e) {
-            common_redirect($e->file->getUrl());
+            common_redirect($e->file->getUrl(), 302);
         }
 
         common_redirect(File_thumbnail::url($thumbnail->filename));