diff --git a/lib/thinking_sphinx/railtie.rb b/lib/thinking_sphinx/railtie.rb
index ab77e7e78..1d8a17aa8 100644
--- a/lib/thinking_sphinx/railtie.rb
+++ b/lib/thinking_sphinx/railtie.rb
@@ -1,6 +1,8 @@
 class ThinkingSphinx::Railtie < Rails::Railtie
-  ActiveSupport.on_load :active_record do
-    include ThinkingSphinx::ActiveRecord::Base
+  initializer 'thinking_sphinx.initialisation' do
+    if defined?(ActiveRecord::Base)
+      ActiveRecord::Base.send :include, ThinkingSphinx::ActiveRecord::Base
+    end
   end
 
   rake_tasks do