diff --git a/app/controllers/users/commencer_controller.rb b/app/controllers/users/commencer_controller.rb
index 598624b9906..74e717b6910 100644
--- a/app/controllers/users/commencer_controller.rb
+++ b/app/controllers/users/commencer_controller.rb
@@ -106,11 +106,11 @@ def prefill_params_present?
     end
 
     def retrieve_procedure
-      Procedure.publiees.or(Procedure.brouillons).find_by(path: params[:path])
+      Procedure.publiees.or(Procedure.brouillons).find_by(path: params[:path]&.downcase)
     end
 
     def retrieve_procedure_with_closed
-      Procedure.publiees.or(Procedure.brouillons).or(Procedure.closes).order(published_at: :desc).find_by(path: params[:path])
+      Procedure.publiees.or(Procedure.brouillons).or(Procedure.closes).order(published_at: :desc).find_by(path: params[:path]&.downcase)
     end
 
     def build_prefilled_dossier