diff -r 5087560b51b6 -r df60d20f965c src/ldt/ldt/security/__init__.py
--- a/src/ldt/ldt/security/__init__.py	Thu Apr 02 17:29:54 2015 +0200
+++ b/src/ldt/ldt/security/__init__.py	Fri Apr 03 17:52:48 2015 +0200
@@ -4,13 +4,12 @@
 from django.core.signals import request_started
 from ldt.security.permissionchecker import check_object_perm_for_user 
 
-User = get_user_model()
 
 try:
     from threading import local
 except ImportError:
     from django.utils._threading_local import local
-        
+
 _thread_locals = local()
 
 # The function that protect models is called on the first
@@ -36,14 +35,14 @@
     if hasattr(get_anonymous_user, 'anonymous_user'):
         return get_anonymous_user.anonymous_user
     
-    get_anonymous_user.anonymous_user = User.objects.get(id=settings.ANONYMOUS_USER_ID)
+    get_anonymous_user.anonymous_user = get_user_model().objects.get(id=settings.ANONYMOUS_USER_ID)
     return get_anonymous_user.anonymous_user 
 
 def get_current_user_or_admin():
     current = get_current_user()
     if current:
         return current
-    admin = User.objects.filter(is_superuser=True)[0]
+    admin = get_user_model().objects.filter(is_superuser=True)[0]
     return admin
 
 def protect_models():