diff --git a/lib/active_model_serializers.rb b/lib/active_model_serializers.rb
index adb444e3..3019cd99 100644
--- a/lib/active_model_serializers.rb
+++ b/lib/active_model_serializers.rb
@@ -1,7 +1,7 @@
 require "active_model"
 require "active_model/serializer"
 
-ActiveModel::Serialization.class_eval do
+module ActiveModel::SerializerSupport
   extend ActiveSupport::Concern
 
   module ClassMethods #:nodoc:
@@ -25,6 +25,10 @@ ActiveModel::Serialization.class_eval do
   alias :read_attribute_for_serialization :send
 end
 
+ActiveSupport.on_load(:active_record) do
+  include ActiveModel::SerializerSupport
+end
+
 begin
   require 'action_controller'
   require 'action_controller/serialization'
diff --git a/test/serializer_test.rb b/test/serializer_test.rb
index 5fd71cdd..b790f23e 100644
--- a/test/serializer_test.rb
+++ b/test/serializer_test.rb
@@ -16,7 +16,7 @@ class SerializerTest < ActiveModel::TestCase
   end
 
   class User
-    include ActiveModel::Serialization
+    include ActiveModel::SerializerSupport
 
     attr_accessor :superuser