diff --git a/app/models/procedure.rb b/app/models/procedure.rb
index c90c4b886..fdd45c80c 100644
--- a/app/models/procedure.rb
+++ b/app/models/procedure.rb
@@ -61,6 +61,8 @@ class Procedure < ApplicationRecord
 
   include Discard::Model
   self.discard_column = :hidden_at
+  self.ignored_columns = [:durees_conservation_required, :cerfa_flag, :test_started_at]
+
   default_scope -> { kept }
 
   OLD_MAX_DUREE_CONSERVATION = 36