diff --git a/lib/validates_timeliness/attribute_methods.rb b/lib/validates_timeliness/attribute_methods.rb
index 5264fa6..4777e57 100644
--- a/lib/validates_timeliness/attribute_methods.rb
+++ b/lib/validates_timeliness/attribute_methods.rb
@@ -3,7 +3,7 @@ module ValidatesTimeliness
     extend ActiveSupport::Concern
 
     included do
-      class_inheritable_accessor :timeliness_validated_attributes
+      class_attribute :timeliness_validated_attributes
       self.timeliness_validated_attributes = []
     end