diff --git a/lib/awestruct/engine.rb b/lib/awestruct/engine.rb
index 43d1b94d..c2ac7c78 100644
--- a/lib/awestruct/engine.rb
+++ b/lib/awestruct/engine.rb
@@ -30,6 +30,7 @@
 require 'awestruct/extensions/tag_cloud'
 require 'awestruct/extensions/intense_debate'
 require 'awestruct/extensions/disqus'
+require 'awestruct/extensions/flattr'
 require 'awestruct/extensions/google_analytics'
 require 'awestruct/extensions/partial'