diff --git a/contrib/templates/default/post_retry.mustache b/contrib/templates/default/post_retry.mustache
index 5540d6d..57f5a3d 100644
--- a/contrib/templates/default/post_retry.mustache
+++ b/contrib/templates/default/post_retry.mustache
@@ -8,7 +8,7 @@
   <body>    
     <form enctype="multipart/form-data" name="post" method="post">
     {{#attachment}}
-    <input type="hidden" name="attachment" filename="{{attachment_filename}}" value="{{attachment}}" />
+    <input type="hidden" accept="{{attachment_type}}" name="attachment" filename="{{attachment_filename}}" value="{{attachment}}" />
     {{/attachment}}
     <input type="hidden" name="reference" value="{{reference}}" />
     <input type="hidden" name="name" value="{{name}}" />
