diff --git a/app/models/traitement.rb b/app/models/traitement.rb
index c7abd45ae..60e50b0ca 100644
--- a/app/models/traitement.rb
+++ b/app/models/traitement.rb
@@ -10,7 +10,7 @@
 #  dossier_id        :bigint
 #
 class Traitement < ApplicationRecord
-  belongs_to :dossier
+  belongs_to :dossier, optional: false
 
   scope :termine_close_to_expiration, -> do
     joins(dossier: :procedure)