diff --git a/twython_django_oauth/models.py b/twython_django_oauth/models.py
index bb9ce71..04fe548 100644
--- a/twython_django_oauth/models.py
+++ b/twython_django_oauth/models.py
@@ -10,6 +10,6 @@ class TwitterProfile(models.Model):
         oauth_secret in relation to a user. Adapt this if you have a current
         setup, there's really nothing special going on here.
     """
-    user = models.OneToOneField(User)
+    user = models.OneToOneField(User, on_delete=models.CASCADE)
     oauth_token = models.CharField(max_length=200)
     oauth_secret = models.CharField(max_length=200)