diff --git a/app_new/core/routes/setup_wizard.py b/app_new/core/routes/setup_wizard.py
index bccb563..f99ac1f 100644
--- a/app_new/core/routes/setup_wizard.py
+++ b/app_new/core/routes/setup_wizard.py
@@ -31,6 +31,10 @@ def is_setup_complete():
 @setup_wizard_bp.before_request
 def protect_initial_setup():
     """Exige un jeton d'environnement tant que l'installation est incomplète."""
+    # Le panneau de gestion reste accessible aux administrateurs connectés,
+    # même si le marqueur du volume instance a été perdu lors d'un redéploiement.
+    if request.endpoint == 'setup_wizard.admin_panel' and current_user.is_authenticated and current_user.is_admin():
+        return None
     if is_setup_complete():
         return None
 
diff --git a/tests/integration/test_setup_admin_access.py b/tests/integration/test_setup_admin_access.py
new file mode 100644
index 0000000..4189f5d
--- /dev/null
+++ b/tests/integration/test_setup_admin_access.py
@@ -0,0 +1,3 @@
+def test_admin_panel_does_not_depend_on_setup_marker(authenticated_client):
+    response = authenticated_client.get('/setup-wizard/admin')
+    assert response.status_code == 200