diff --git a/app/views/gestionnaires/dossiers/_header.html.haml b/app/views/gestionnaires/dossiers/_header.html.haml
index 61afc1361..1eda6a77a 100644
--- a/app/views/gestionnaires/dossiers/_header.html.haml
+++ b/app/views/gestionnaires/dossiers/_header.html.haml
@@ -18,13 +18,16 @@
               = link_to "Tout le dossier", print_gestionnaire_dossier_path(dossier.procedure, dossier), target: "_blank", rel: "noopener", class: "menu-item menu-link"
             %li
               = link_to "Uniquement cet onglet", "#", onclick: "window.print()", class: "menu-item menu-link"
-        - if Flipflop.download_as_zip_enabled? && dossier.attachments_downloadable?
+        - if Flipflop.download_as_zip_enabled? && !PiecesJustificativesService.liste_pieces_justificatives(dossier).empty?
           %span.dropdown.print-menu-opener
             %button.button.dropdown-button.icon-only
               %span.icon.attachment
             %ul.print-menu.dropdown-content
               %li
-                = link_to "Télécharger toutes les pièces jointes", telecharger_pjs_gestionnaire_dossier_path(dossier.procedure, dossier), target: "_blank", rel: "noopener", class: "menu-item menu-link"
+                - if PiecesJustificativesService.pieces_justificatives_total_size(dossier) < 50.megabytes
+                  = link_to "Télécharger toutes les pièces jointes", telecharger_pjs_gestionnaire_dossier_path(dossier.procedure, dossier), target: "_blank", rel: "noopener", class: "menu-item menu-link"
+                - else
+                  %p.menu-item Le téléchargement des dossiers est désactivé pour les dossiers de plus de 50Mo.
 
 
         = render partial: "gestionnaires/procedures/dossier_actions", locals: { procedure: dossier.procedure, dossier: dossier, dossier_is_followed: current_gestionnaire&.follow?(dossier) }