diff --git a/activerecord/lib/active_record/serializers/json_serializer.rb b/activerecord/lib/active_record/serializers/json_serializer.rb
index e49cf59494d33f7a0f1b0bec05e219a036e632fc..21afcd6e5c7725a0172bc0cc97464f81235aeb3e 100644
--- a/activerecord/lib/active_record/serializers/json_serializer.rb
+++ b/activerecord/lib/active_record/serializers/json_serializer.rb
@@ -1,5 +1,5 @@
 require 'active_support/json'
-require 'active_support/core_ext/module/model_naming'
+require 'active_model/naming'
 
 module ActiveRecord #:nodoc:
   module Serialization