diff --git a/lib/seed-fu.rb b/lib/seed-fu.rb
index 4748559..933c0f4 100644
--- a/lib/seed-fu.rb
+++ b/lib/seed-fu.rb
@@ -31,6 +31,6 @@ def self.seed(fixture_paths = SeedFu.fixture_paths, filter = nil)
 end
 
 # @public
-class ActiveRecord::Base
+ActiveSupport.on_load(:active_record) do
   extend SeedFu::ActiveRecordExtension
 end