diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 211cd6151..89dc136e0 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -68,7 +68,7 @@ class AttachmentsController < ApplicationController
       @attachment.increment_download
     end
 
-    if stale?(:etag => @attachment.digest)
+    if stale?(:etag => @attachment.digest, :template => false)
       # images are sent inline
       send_file @attachment.diskfile, :filename => filename_for_content_disposition(@attachment.filename),
                                       :type => detect_content_type(@attachment),
@@ -78,7 +78,7 @@ class AttachmentsController < ApplicationController
 
   def thumbnail
     if @attachment.thumbnailable? && tbnail = @attachment.thumbnail(:size => params[:size])
-      if stale?(:etag => tbnail)
+      if stale?(:etag => tbnail, :template => false)
         send_file tbnail,
           :filename => filename_for_content_disposition(@attachment.filename),
           :type => detect_content_type(@attachment),