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-rw-r--r--activerecord/lib/active_record/enum.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/enum.rb b/activerecord/lib/active_record/enum.rb
index 7ded96f8fb..610b863794 100644
--- a/activerecord/lib/active_record/enum.rb
+++ b/activerecord/lib/active_record/enum.rb
@@ -95,7 +95,7 @@ module ActiveRecord
module Enum
def self.extended(base) # :nodoc:
- base.class_attribute(:defined_enums)
+ base.class_attribute(:defined_enums, instance_writer: false)
base.defined_enums = {}
end