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-rw-r--r--activemodel/lib/active_model/serializers/json.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/serializers/json.rb b/activemodel/lib/active_model/serializers/json.rb
index b66dbf1afe..b64a8299e6 100644
--- a/activemodel/lib/active_model/serializers/json.rb
+++ b/activemodel/lib/active_model/serializers/json.rb
@@ -10,7 +10,7 @@ module ActiveModel
included do
extend ActiveModel::Naming
- class_attribute :include_root_in_json
+ class_attribute :include_root_in_json, instance_writer: false
self.include_root_in_json = false
end