diff --git a/rest_framework/authtoken/migrations/0001_initial.py b/rest_framework/authtoken/migrations/0001_initial.py
index 0eb9fbcbe..75780fedf 100644
--- a/rest_framework/authtoken/migrations/0001_initial.py
+++ b/rest_framework/authtoken/migrations/0001_initial.py
@@ -17,7 +17,7 @@ class Migration(migrations.Migration):
             fields=[
                 ('key', models.CharField(primary_key=True, serialize=False, max_length=40)),
                 ('created', models.DateTimeField(auto_now_add=True)),
-                ('user', models.OneToOneField(to=settings.AUTH_USER_MODEL, related_name='auth_token')),
+                ('user', models.OneToOneField(to=settings.AUTH_USER_MODEL, related_name='auth_token', on_delete=models.CASCADE)),
             ],
             options={
             },
diff --git a/rest_framework/authtoken/migrations/0002_auto_20160226_1747.py b/rest_framework/authtoken/migrations/0002_auto_20160226_1747.py
index 98e0bb670..9f7e58e22 100644
--- a/rest_framework/authtoken/migrations/0002_auto_20160226_1747.py
+++ b/rest_framework/authtoken/migrations/0002_auto_20160226_1747.py
@@ -29,6 +29,6 @@ class Migration(migrations.Migration):
         migrations.AlterField(
             model_name='token',
             name='user',
-            field=models.OneToOneField(to=settings.AUTH_USER_MODEL, verbose_name='User', related_name='auth_token'),
+            field=models.OneToOneField(to=settings.AUTH_USER_MODEL, verbose_name='User', related_name='auth_token', on_delete=models.CASCADE),
         ),
     ]
diff --git a/tests/test_multitable_inheritance.py b/tests/test_multitable_inheritance.py
index 643d8f738..611333aa8 100644
--- a/tests/test_multitable_inheritance.py
+++ b/tests/test_multitable_inheritance.py
@@ -17,7 +17,7 @@ class ChildModel(ParentModel):
 
 
 class AssociatedModel(RESTFrameworkModel):
-    ref = models.OneToOneField(ParentModel, primary_key=True)
+    ref = models.OneToOneField(ParentModel, primary_key=True, on_delete=models.CASCADE)
     name = models.CharField(max_length=100)
 
 
diff --git a/tests/test_relations_generic.py b/tests/test_relations_generic.py
index 340d4d1d1..babc2269c 100644
--- a/tests/test_relations_generic.py
+++ b/tests/test_relations_generic.py
@@ -17,7 +17,7 @@ class Tag(models.Model):
     Tags have a descriptive slug, and are attached to an arbitrary object.
     """
     tag = models.SlugField()
-    content_type = models.ForeignKey(ContentType)
+    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
     object_id = models.PositiveIntegerField()
     tagged_item = GenericForeignKey('content_type', 'object_id')