diff --git a/authens/conf.py b/authens/conf.py
index 04b5cb0..94d8cf5 100644
--- a/authens/conf.py
+++ b/authens/conf.py
@@ -1,2 +1,3 @@
 LDAP_SERVER_URL = "ldaps://ldap.spi.ens.fr:636"
+AUTHENS_USE_OLDCAS = True
 # TODO: CAS_SERVER_URL
diff --git a/authens/templates/authens/login_switch.html b/authens/templates/authens/login_switch.html
index 50d38e3..62e9d7d 100644
--- a/authens/templates/authens/login_switch.html
+++ b/authens/templates/authens/login_switch.html
@@ -13,8 +13,10 @@
   <a class="big-button exte" href="{% url "authens:login.pwd" %}?next={{ next| urlencode }}">
     {% trans "Mot de passe" %}
   </a>
-  <a class="big-button oldcas" href="{% url "authens:login.oldcas" %}?next={{ next| urlencode }}">
-    {% trans "Vieilleux" %}
-  </a>
+  {% if oldcas %}
+    <a class="big-button oldcas" href="{% url "authens:login.oldcas" %}?next={{ next| urlencode }}">
+      {% trans "Vieilleux" %}
+    </a>
+  {% endif %}
 </div>
 {% endblock %}
diff --git a/authens/urls.py b/authens/urls.py
index 28dcbfa..18e2aee 100644
--- a/authens/urls.py
+++ b/authens/urls.py
@@ -1,13 +1,13 @@
+from django.conf import settings
 from django.urls import path
 
-from authens import views
+from authens import conf as default_conf, views
 
 app_name = "authens"
 urlpatterns = [
     path("login/choose", views.LoginSwitchView.as_view(), name="login"),
     path("login/cas", views.CASLoginView.as_view(), name="login.cas"),
     path("login/pwd", views.PasswordLoginView.as_view(), name="login.pwd"),
-    path("login/oldcas", views.OldCASLoginView.as_view(), name="login.oldcas"),
     path("logout", views.LogoutView.as_view(), name="logout"),
     path("reset/pwd", views.PasswordResetView.as_view(), name="reset.pwd"),
     path(
@@ -16,3 +16,8 @@ urlpatterns = [
         name="reset.pwd.confirm",
     ),
 ]
+
+if getattr(settings, "AUTHENS_USE_OLDCAS", default_conf.AUTHENS_USE_OLDCAS):
+    urlpatterns += (
+        path("login/oldcas", views.OldCASLoginView.as_view(), name="login.oldcas"),
+    )
diff --git a/authens/views.py b/authens/views.py
index 70134ad..fc63867 100644
--- a/authens/views.py
+++ b/authens/views.py
@@ -11,6 +11,7 @@ from django.utils import timezone
 from django.utils.translation import gettext_lazy as _
 from django.views.generic import TemplateView, View
 
+from authens import conf as default_conf
 from authens.forms import OldCASAuthForm
 from authens.utils import get_cas_client
 
@@ -47,7 +48,15 @@ class LoginSwitchView(NextPageMixin, TemplateView):
 
     def get_context_data(self, **kwargs):
         ctx = super().get_context_data(**kwargs)
-        ctx["next"] = self.get_next_url()
+
+        ctx.update(
+            {
+                "next": self.get_next_url(),
+                "oldcas": getattr(
+                    settings, "AUTHENS_USE_OLDCAS", default_conf.AUTHENS_USE_OLDCAS
+                ),
+            }
+        )
         return ctx
 
 
diff --git a/example_site/example_site/settings.py b/example_site/example_site/settings.py
index fdb8240..8ec4365 100644
--- a/example_site/example_site/settings.py
+++ b/example_site/example_site/settings.py
@@ -130,6 +130,7 @@ AUTHENTICATION_BACKENDS = [
 LOGIN_URL = reverse_lazy("authens:login")
 EMAIL_BACKEND = "django.core.mail.backends.console.EmailBackend"
 
+AUTHENS_USE_OLDCAS = False
 
 # This is cosmetic
 LOGIN_REDIRECT_URL = reverse_lazy("home")