diff --git a/lib/consul/active_record.rb b/lib/consul/active_record.rb
index 0b8c95f..808fbad 100644
--- a/lib/consul/active_record.rb
+++ b/lib/consul/active_record.rb
@@ -14,4 +14,6 @@ def authorize_values_for(property, options = {})
   end
 end
 
-ActiveRecord::Base.send(:extend, Consul::ActiveRecord)
+ActiveSupport.on_load(:active_record) do
+  extend(Consul::ActiveRecord)
+end