diff --git a/lib/deep_cloning.rb b/lib/deep_cloning.rb
index 5b91903..ee37db3 100644
--- a/lib/deep_cloning.rb
+++ b/lib/deep_cloning.rb
@@ -1,3 +1,5 @@
+require 'active_record'
+
 # DeepCloning
 
 module DeepCloning