diff --git a/app/controllers/users/dossiers_controller.rb b/app/controllers/users/dossiers_controller.rb
index 48dc56f3d..c69c4d1d1 100644
--- a/app/controllers/users/dossiers_controller.rb
+++ b/app/controllers/users/dossiers_controller.rb
@@ -219,7 +219,7 @@ module Users
     end
 
     def recherche
-      @dossier_id = params[:dossier_id]
+      @dossier_id = params[:q]
       dossier = current_user.dossiers.find_by(id: @dossier_id)
 
       if dossier
diff --git a/app/views/layouts/_new_header.haml b/app/views/layouts/_new_header.haml
index 034c40bb9..26d7018a5 100644
--- a/app/views/layouts/_new_header.haml
+++ b/app/views/layouts/_new_header.haml
@@ -47,16 +47,17 @@
         %li
           .header-search{ role: 'search' }
             = form_tag instructeur_recherche_path, method: :get, class: "form" do
+              = label_tag :dossier_id, "Numéro de dossier", class: 'hidden'
               = text_field_tag "q", "#{@search_terms if @search_terms.present?}", placeholder: "Rechercher un dossier"
               %button{ title: "Rechercher" }
-                = image_tag "icons/search-blue.svg", alt: ''
+                = image_tag "icons/search-blue.svg", alt: 'Rechercher', 'aria-hidden':'true'
 
       - if nav_bar_profile == :user && user_signed_in? && current_user.dossiers.count > 2
         %li
           .header-search{ role: 'search' }
-            = form_tag recherche_dossiers_path, method: :post, class: "form" do
+            = form_tag recherche_dossiers_path, method: :get, class: "form" do
               = label_tag :dossier_id, "Numéro de dossier", class: 'hidden'
-              = text_field_tag :dossier_id, "", placeholder: "Numéro de dossier"
+              = text_field_tag "q", "#{@search_terms if @search_terms.present?}", placeholder: "Rechercher un dossier"
               %button{ title: "Rechercher" }
                 = image_tag "icons/search-blue.svg", alt: 'Rechercher', 'aria-hidden':'true'
 
diff --git a/config/routes.rb b/config/routes.rb
index 4081570cb..de1a86dd1 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -275,7 +275,7 @@ Rails.application.routes.draw do
       end
 
       collection do
-        post 'recherche'
+        get 'recherche'
       end
     end
     resource :feedback, only: [:create]