Q:

RemovedInDjango19Warning when using django-polymorphic

I started to use django-polymorphic in my project, which is based on Django 1.8.1. 
It works fine, but I get the following warning:
env/lib/python2.7/site-packages/django/contrib/contenttypes/models.py:159: RemovedInDjango19Warning: Model class django.contrib.contenttypes.models. ContentType doesn't declare an explicit app_label and either isn't in an application in INSTALLED_APPS or else was imported before its application was loaded.  This will no longer be supported in Django 1.9. 
  class ContentType(models. Model):

I've plugged Polymorphic like this:
INSTALLED_APPS = (
    'polymorphic',
    'django.contrib.contenttypes',
    ...
    'myapp1',
    'myapp2',
)

In myapp1/models.py I have my base model:
class MyBaseModel(PolymorphicModel):
    id = models. UUIDField(primary_key=True, default=uuid.uuid4)
    # some other fields

And in myapp2/models.py I have my derived models:
from myapp1.models import MyBaseModel

class MyDerivedModel1(MyBaseModel):
    # some fields

class MyDerivedModel2(MyBaseModel):
    # some other fields

Am I doing something wrong? 

A:

Looks like you need to put polymorphic after contenttypes in the list of installed apps.