diff --git a/src/ralph/lib/custom_fields/tests/models.py b/src/ralph/lib/custom_fields/tests/models.py
index 689665d398..eb5f3eaf6f 100644
--- a/src/ralph/lib/custom_fields/tests/models.py
+++ b/src/ralph/lib/custom_fields/tests/models.py
@@ -10,13 +10,13 @@ class SomeModel(WithCustomFieldsMixin, models.Model):
 
     def get_absolute_url(self):
         return reverse(
-            'admin:{}_{}_change'.format(
+            'cf_admin:{}_{}_change'.format(
                 self._meta.app_label, self._meta.model_name
             ), args=(self.pk,)
         )
 
     @classmethod
     def get_add_url(self):
-        return reverse('admin:{}_{}_add'.format(
+        return reverse('cf_admin:{}_{}_add'.format(
             self._meta.app_label, self._meta.model_name
         ))
diff --git a/src/ralph/lib/custom_fields/tests/urls.py b/src/ralph/lib/custom_fields/tests/urls.py
index 02a4e6106d..84686c735c 100644
--- a/src/ralph/lib/custom_fields/tests/urls.py
+++ b/src/ralph/lib/custom_fields/tests/urls.py
@@ -2,9 +2,7 @@
 
 from . import admin, api
 
-cf_tests_urls, cf_tests_app_name, cf_tests_namespace = admin.site.urls
-import ipdb; ipdb.set_trace()
 urlpatterns = [
-    url(r'^cf_tests_admin/', include((cf_tests_urls, 'ralph', 'admin'))),
+    url(r'^cf_tests_admin/', include(admin.site.urls)),
     url(r'^cf_test_api/', include(api.urlpatterns))
 ]
diff --git a/src/ralph/urls/base.py b/src/ralph/urls/base.py
index dc6ecc85a7..49ed831dc0 100644
--- a/src/ralph/urls/base.py
+++ b/src/ralph/urls/base.py
@@ -29,10 +29,9 @@
 # api views are registered in router)
 api_urls += [url(r'^', include(router.urls))]
 
-ralph_urls, ralph_app_name, ralph_namespace = admin.urls
 urlpatterns = [
     # override app_name (admin) with ralph (mainly for sitetree)
-    url(r'^', include((ralph_urls, 'ralph', ralph_namespace))),
+    url(r'^', include(admin.urls)),
     url(r'^api/', include(api_urls)),
     url(r'^api-token-auth/', views.obtain_auth_token),
     url(r'^', include('ralph.dc_view.urls.ui')),
@@ -48,3 +47,10 @@
 
 if getattr(settings, 'ENABLE_HERMES_INTEGRATION', False):
     urlpatterns += url(r'^hermes/', include('pyhermes.apps.django.urls')),
+
+
+# monkey patch for sitetree until
+# https://github.com/idlesign/django-sitetree/issues/226 will be discussed
+# and resolved
+from sitetree.sitetreeapp import SiteTree  # noqa
+SiteTree.current_app_is_admin = lambda self: False