diff --git a/app/models/champs/rna_champ.rb b/app/models/champs/rna_champ.rb
index 016fac95a..1cb9a7a70 100644
--- a/app/models/champs/rna_champ.rb
+++ b/app/models/champs/rna_champ.rb
@@ -22,7 +22,7 @@
 class Champs::RNAChamp < Champ
   validates :value, allow_blank: true, format: {
     with: /\AW[0-9]{9}\z/, message: I18n.t(:not_a_rna, scope: 'activerecord.errors.messages')
-  }
+  }, if: -> { validation_context != :brouillon }
 
   delegate :id, to: :procedure, prefix: true