diff --git a/server.rb b/server.rb
index ef9c496..0190442 100755
--- a/server.rb
+++ b/server.rb
@@ -132,6 +132,7 @@ def get_part_by_id(id)
       part["attachments"] << ATTACHMENTS + "/" + part["name"] + "/" + file
     end
   end
+  part["attachments"].sort!
   if parent then
     part["attachments"] += parent["attachments"]
   end