diff --git a/lib/delayed_attachment_fu.rb b/lib/delayed_attachment_fu.rb
index 0e0ded6..0848f7c 100644
--- a/lib/delayed_attachment_fu.rb
+++ b/lib/delayed_attachment_fu.rb
@@ -39,14 +39,11 @@ module DelayedAttachmentFu
     end
 
     def public_filename(size=nil)
-      force = (size == :uploaded)
-      if force
-        size = nil
-      end
+      force, size = true, nil if size == :uploaded
       if !self.thumbnailable? || self.thumbnails_processed || force
-        super(size.to_s)
+        super size
       else
-        size ||= 'thumb'
+        size ||= :thumb
         '/images/icons-app/image-loading-%s.png' % size
       end
     end
--
libgit2 0.21.2