diff --git a/rest_framework/runtests/settings.py b/rest_framework/runtests/settings.py
index be7216580..3fc0eb2f4 100644
--- a/rest_framework/runtests/settings.py
+++ b/rest_framework/runtests/settings.py
@@ -100,6 +100,9 @@ INSTALLED_APPS = (
     'rest_framework',
     'rest_framework.authtoken',
     'rest_framework.tests',
+    'rest_framework.tests.accounts',
+    'rest_framework.tests.records',
+    'rest_framework.tests.users',
 )
 
 # OAuth is optional and won't work if there is no oauth_provider & oauth2
diff --git a/rest_framework/tests/accounts/__init__.py b/rest_framework/tests/accounts/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/rest_framework/tests/accounts/models.py b/rest_framework/tests/accounts/models.py
new file mode 100644
index 000000000..525e601ba
--- /dev/null
+++ b/rest_framework/tests/accounts/models.py
@@ -0,0 +1,8 @@
+from django.db import models
+
+from rest_framework.tests.users.models import User
+
+
+class Account(models.Model):
+    owner = models.ForeignKey(User, related_name='accounts_owned')
+    admins = models.ManyToManyField(User, blank=True, null=True, related_name='accounts_administered')
diff --git a/rest_framework/tests/accounts/serializers.py b/rest_framework/tests/accounts/serializers.py
new file mode 100644
index 000000000..a27b9ca6f
--- /dev/null
+++ b/rest_framework/tests/accounts/serializers.py
@@ -0,0 +1,11 @@
+from rest_framework import serializers
+
+from rest_framework.tests.accounts.models import Account
+from rest_framework.tests.users.serializers import UserSerializer
+
+
+class AccountSerializer(serializers.ModelSerializer):
+    admins = UserSerializer(many=True)
+
+    class Meta:
+        model = Account
diff --git a/rest_framework/tests/records/__init__.py b/rest_framework/tests/records/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/rest_framework/tests/records/models.py b/rest_framework/tests/records/models.py
new file mode 100644
index 000000000..769548074
--- /dev/null
+++ b/rest_framework/tests/records/models.py
@@ -0,0 +1,6 @@
+from django.db import models
+
+
+class Record(models.Model):
+    account = models.ForeignKey('accounts.Account', blank=True, null=True)
+    owner = models.ForeignKey('users.User', blank=True, null=True)
diff --git a/rest_framework/tests/test_serializer_nested.py b/rest_framework/tests/test_serializer_nested.py
index 7114a0603..686a1f5f4 100644
--- a/rest_framework/tests/test_serializer_nested.py
+++ b/rest_framework/tests/test_serializer_nested.py
@@ -346,3 +346,8 @@ class NestedModelSerializerUpdateTests(TestCase):
         result.save()
         self.assertEqual(result.id, john.id)
 
+
+class ImportingModelSerializerWithStrForeignKeys(TestCase):
+    def test_import_model_serializer(self):
+        from rest_framework.tests.accounts.serializers import AccountSerializer
+        self.assertIsInstance(AccountSerializer(), serializers.ModelSerializer)
diff --git a/rest_framework/tests/users/__init__.py b/rest_framework/tests/users/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/rest_framework/tests/users/models.py b/rest_framework/tests/users/models.py
new file mode 100644
index 000000000..128bac90b
--- /dev/null
+++ b/rest_framework/tests/users/models.py
@@ -0,0 +1,6 @@
+from django.db import models
+
+
+class User(models.Model):
+    account = models.ForeignKey('accounts.Account', blank=True, null=True, related_name='users')
+    active_record = models.ForeignKey('records.Record', blank=True, null=True)
diff --git a/rest_framework/tests/users/serializers.py b/rest_framework/tests/users/serializers.py
new file mode 100644
index 000000000..da4965540
--- /dev/null
+++ b/rest_framework/tests/users/serializers.py
@@ -0,0 +1,8 @@
+from rest_framework import serializers
+
+from rest_framework.tests.users.models import User
+
+
+class UserSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = User