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-rw-r--r--activerecord/lib/active_record/serializers/json_serializer.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/serializers/json_serializer.rb b/activerecord/lib/active_record/serializers/json_serializer.rb
index 1fd65ed006..c709c3f1eb 100644
--- a/activerecord/lib/active_record/serializers/json_serializer.rb
+++ b/activerecord/lib/active_record/serializers/json_serializer.rb
@@ -1,3 +1,5 @@
+require 'active_support/json'
+
module ActiveRecord #:nodoc:
module Serialization
def self.included(base)