diff --git a/lib/tasks/deployment/20211110093332_set_dossiers_processed_at.rake b/lib/tasks/deployment/20211110093332_set_dossiers_processed_at.rake
index 3129c5033..335d7fbe2 100644
--- a/lib/tasks/deployment/20211110093332_set_dossiers_processed_at.rake
+++ b/lib/tasks/deployment/20211110093332_set_dossiers_processed_at.rake
@@ -7,7 +7,7 @@ namespace :after_party do
     progress = ProgressReport.new(dossiers.count)
 
     dossiers.find_each do |dossier|
-      if dossier.processed_at != dossier.traitement.processed_at
+      if dossier.read_attribute(:processed_at) != dossier.traitement.processed_at
         dossier.update_column(:processed_at, dossier.traitement.processed_at)
       end
       progress.inc