diff --git a/wger/core/views/user.py b/wger/core/views/user.py
index 32f4d6702..16df45cea 100644
--- a/wger/core/views/user.py
+++ b/wger/core/views/user.py
@@ -198,13 +198,11 @@ def trainer_login(request, user_pk):
             or user.has_perm('gym.manage_gyms')):
         own = True
 
-    # Note: it seems we have to manually set the authentication backend here
-    # - https://docs.djangoproject.com/en/1.6/topics/auth/default/#auth-web-requests
-    # - http://stackoverflow.com/questions/3807777/django-login-without-authenticating
+    # Note: when logging without authenticating, it is necessary to set the
+    # authentication backend
     if own:
         del(request.session['trainer.identity'])
-    user.backend = 'django.contrib.auth.backends.ModelBackend'
-    django_login(request, user)
+    django_login(request, user, 'django.contrib.auth.backends.ModelBackend')
 
     if not own:
         request.session['trainer.identity'] = orig_user_pk