diff --git a/docs/advanced_options.rst b/docs/advanced_options.rst
index 4462fc2..0e1b0e6 100644
--- a/docs/advanced_options.rst
+++ b/docs/advanced_options.rst
@@ -272,3 +272,9 @@ Settings
 
 ``MODERATION_MODERATORS``
     Tuple of moderators' email addresses to which notifications will be sent.
+
+Using with proxy classes
+--------
+
+- Register each proxy class individually.
+- Register concrete class **also** but only after registering any proxy classes under this concrete class.
\ No newline at end of file
diff --git a/example_project/urls.py b/example_project/urls.py
index 43e57be..f34156f 100644
--- a/example_project/urls.py
+++ b/example_project/urls.py
@@ -4,10 +4,10 @@
 from django.contrib import admin
 from django.contrib.auth import views as auth_views
 
-from moderation.helpers import auto_discover
+from django.utils.module_loading import autodiscover_modules
 
 admin.autodiscover()
-auto_discover()
+autodiscover_modules("moderator")
 
 handler500  # Pyflakes
 
diff --git a/moderation/admin.py b/moderation/admin.py
index a8f183a..2087387 100644
--- a/moderation/admin.py
+++ b/moderation/admin.py
@@ -184,7 +184,7 @@ def change_view(self, request, object_id, extra_context=None):
                 elif 'reject' in request.POST:
                     moderated_object.reject(request.user, reason)
 
-        content_type = ContentType.objects.get_for_model(changed_obj.__class__)
+        content_type = ContentType.objects.get_for_model(changed_obj.__class__, for_concrete_model=False)
         try:
             object_admin_url = reverse(
                 "admin:%s_%s_change" % (content_type.app_label, content_type.model),
diff --git a/moderation/filterspecs.py b/moderation/filterspecs.py
index 7fc4095..385a609 100644
--- a/moderation/filterspecs.py
+++ b/moderation/filterspecs.py
@@ -12,7 +12,7 @@ def _registered_content_types():
     registered = list(moderation._registered_models.keys())
     registered.sort(key=lambda obj: obj.__name__)
     for model in registered:
-        content_types.append(ContentType.objects.get_for_model(model))
+        content_types.append(ContentType.objects.get_for_model(model, for_concrete_model=False))
     return content_types
 
 
diff --git a/moderation/managers.py b/moderation/managers.py
index 077ec8a..b1d72ad 100644
--- a/moderation/managers.py
+++ b/moderation/managers.py
@@ -71,12 +71,12 @@ def get_for_instance(self, instance):
         try:
             moderated_object = self.get(
                 object_pk=instance.pk,
-                content_type=ContentType.objects.get_for_model(instance.__class__),
+                content_type=ContentType.objects.get_for_model(instance.__class__, for_concrete_model=False),
             )
         except self.model.MultipleObjectsReturned:
             # Get the most recent one
             moderated_object = self.filter(
                 object_pk=instance.pk,
-                content_type=ContentType.objects.get_for_model(instance.__class__),
+                content_type=ContentType.objects.get_for_model(instance.__class__, for_concrete_model=False),
             ).order_by('-updated')[0]
         return moderated_object