diff --git a/lib/attr_encrypted/adapters/active_record.rb b/lib/attr_encrypted/adapters/active_record.rb
index 1be38ca1..fca9343e 100644
--- a/lib/attr_encrypted/adapters/active_record.rb
+++ b/lib/attr_encrypted/adapters/active_record.rb
@@ -136,6 +136,8 @@ def method_missing_with_attr_encrypted(method, *args, &block)
     end
   end
 
-  ActiveRecord::Base.extend AttrEncrypted
-  ActiveRecord::Base.extend AttrEncrypted::Adapters::ActiveRecord
+  ActiveSupport.on_load(:active_record) do
+    extend AttrEncrypted
+    extend AttrEncrypted::Adapters::ActiveRecord
+  end
 end