diff --git a/app/controllers/manager/users_controller.rb b/app/controllers/manager/users_controller.rb
index 9e1a9fc54..eb2c9e169 100644
--- a/app/controllers/manager/users_controller.rb
+++ b/app/controllers/manager/users_controller.rb
@@ -24,7 +24,7 @@ module Manager
     def delete
       user = User.find(params[:id])
       if !user.can_be_deleted?
-        fail "Impossible de supprimer cet utilisateur car il a des dossiers en instruction"
+        fail "Impossible de supprimer cet utilisateur. Il a des dossiers en instruction ou il est administrateur."
       end
       user.delete_and_keep_track_dossiers(current_administration)
 
diff --git a/app/models/user.rb b/app/models/user.rb
index 8fc852bde..16412ddf8 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -97,7 +97,7 @@ class User < ApplicationRecord
   end
 
   def can_be_deleted?
-    dossiers.state_instruction_commencee.empty?
+    administrateur.nil? && dossiers.state_instruction_commencee.empty?
   end
 
   def delete_and_keep_track_dossiers(administration)
diff --git a/app/views/manager/users/show.html.erb b/app/views/manager/users/show.html.erb
index ab51789a6..2d3f24982 100644
--- a/app/views/manager/users/show.html.erb
+++ b/app/views/manager/users/show.html.erb
@@ -25,7 +25,7 @@ as well as a link to its edit page.
   </h1>
 
   <div>
-    <%= button_to "supprimer", delete_manager_user_path(page.resource), method: :delete, disabled: !page.resource.can_be_deleted?, class: "button", data: { confirm: "Confirmez-vous la suppression de l'utilisateur ?" }, title: page.resource.can_be_deleted? ? "Supprimer" : "Cet utilisateur a des dossiers dont l'instruction a commencé et ne peut être supprimé" %>
+    <%= button_to "supprimer", delete_manager_user_path(page.resource), method: :delete, disabled: !page.resource.can_be_deleted?, class: "button", data: { confirm: "Confirmez-vous la suppression de l'utilisateur ?" }, title: page.resource.can_be_deleted? ? "Supprimer" : "Cet utilisateur ne peut être supprimé. Il a des dossiers dont l'instruction a commencé ou c'est un administrateur" %>
 
   </div>
   <div>
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index a09927084..9c3c6bde8 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -224,6 +224,16 @@ describe User, type: :model do
     context 'when the user has no dossier in instruction' do
       it { is_expected.to be true }
     end
+
+    context 'when the user is an administrateur' do
+      it 'cannot be deleted' do
+        administrateur = create(:administrateur)
+        user = administrateur.user
+
+        expect(user.can_be_deleted?).to be_falsy
+      end
+    end
+
   end
 
   describe '#delete_and_keep_track_dossiers' do