diff --git a/lib/active_model_serializers.rb b/lib/active_model_serializers.rb
index 380ee1c3..33aa902b 100644
--- a/lib/active_model_serializers.rb
+++ b/lib/active_model_serializers.rb
@@ -57,7 +57,7 @@ module ActiveModel::SerializerSupport
 end
 
 ActiveSupport.on_load(:active_record) do
-  ActiveRecord::Base.send(:include, ActiveModel::SerializerSupport)
+  include ActiveModel::SerializerSupport
 end
 
 module ActiveModel::ArraySerializerSupport
@@ -78,7 +78,7 @@ begin
   require 'action_controller/serialization'
 
   ActiveSupport.on_load(:action_controller) do
-    ActionController::Base.send(:include, ActionController::Serialization)
+    include ::ActionController::Serialization
   end
 rescue LoadError => ex
   # rails on installed, continuing
diff --git a/test/serializer_support_test.rb b/test/serializer_support_test.rb
index 74190fb9..2e963027 100644
--- a/test/serializer_support_test.rb
+++ b/test/serializer_support_test.rb
@@ -9,8 +9,6 @@ class RandomModelCollection
 end
 
 module ActiveRecord
-  class Base
-  end
   class Relation
   end
 end
@@ -28,15 +26,5 @@ class SerializerSupportTest < ActiveModel::TestCase
     ActiveSupport.run_load_hooks(:active_record)
     assert_equal ActiveModel::ArraySerializer, ActiveRecord::Relation.new.active_model_serializer
   end
-
-  test "it automatically includes serializer support in active_record/base" do
-    ActiveSupport.run_load_hooks(:active_record)
-    assert ActiveRecord::Base.new.respond_to?(:active_model_serializer)
-  end
-
-  test "it automatically includes serializer support in action_controller/base" do
-    ActiveSupport.run_load_hooks(:action_controller)
-    assert ActionController::Base.new.respond_to?(:serialization_scope)
-  end
 end