diff --git a/init.rb b/init.rb
index 9f6606a..46d3bd3 100644
--- a/init.rb
+++ b/init.rb
@@ -1,3 +1 @@
-ActiveRecord::Base.class_eval do
-  include Xapit::Membership
-end
+require 'xapit'
diff --git a/lib/xapit/membership.rb b/lib/xapit/membership.rb
index bd002b7..f83bfcc 100644
--- a/lib/xapit/membership.rb
+++ b/lib/xapit/membership.rb
@@ -119,3 +119,9 @@ def xapit_facet_blueprint(attribute)
     end
   end
 end
+
+if defined? ActiveRecord
+  ActiveRecord::Base.class_eval do
+    include Xapit::Membership
+  end
+end