diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index 58e57f04..5458a522 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -9,6 +9,8 @@ require 'active_model/serializer/utils'
 
 module ActiveModel
   class Serializer
+    extend ActiveSupport::Autoload
+
     include Configuration
     include Associations