diff --git a/app/models/uploaded_file.rb b/app/models/uploaded_file.rb
index 469537f..430ba51 100644
--- a/app/models/uploaded_file.rb
+++ b/app/models/uploaded_file.rb
@@ -3,6 +3,8 @@ class UploadedFile < Article
   # FIXME need to define min/max file size
   has_attachment :thumbnails => { :icon => [24,24] }, :storage => :file_system
 
+  validates_as_attachment
+
   def icon_name
     self.image? ? public_filename(:icon) : self.content_type.gsub('/', '-')
   end
--
libgit2 0.21.2