diff --git a/app/views/archive_feeds/rssfeed.rss.builder b/app/views/archive_feeds/rssfeed.rss.builder
index a3c0046..cc3a6f7 100644
--- a/app/views/archive_feeds/rssfeed.rss.builder
+++ b/app/views/archive_feeds/rssfeed.rss.builder
@@ -8,7 +8,7 @@ xml.rss :version => "2.0" do
       xml.item do
         xml.title archive_file.title
         xml.description archive_file.description
-        xml.pubDate archive_file.created_at.to_s(:rfc822)
+        xml.pubDate archive_file.created_at.to_fs(:rfc822)
         xml.link page_for_archive_file(archive_file, true)
       end
     end