diff --git a/modeltranslation/tests/__init__.py b/modeltranslation/tests/__init__.py
index d4e82cd..5ef5a7d 100644
--- a/modeltranslation/tests/__init__.py
+++ b/modeltranslation/tests/__init__.py
@@ -13,6 +13,7 @@ from django.core.exceptions import ValidationError, ImproperlyConfigured
 from django.core.files.base import ContentFile
 from django.core.files.storage import default_storage
 from django.core.management import call_command
+from django.db import IntegrityError
 from django.db.models import Q, F
 from django.db.models.loading import AppCache
 from django.test import TestCase
@@ -37,7 +38,7 @@ from modeltranslation.utils import (build_css_class, build_localized_fieldname,
 request = None
 
 # How many models are registered for tests.
-TEST_MODELS = 25
+TEST_MODELS = 26
 
 
 class reload_override_settings(override_settings):
@@ -449,6 +450,17 @@ class ModeltranslationTest(ModeltranslationTestBase):
         )
         self._test_constructor(keywords)
 
+    def test_unique_nullable_field(self):
+        models.UniqueNullableModel.objects.create()
+        models.UniqueNullableModel.objects.create()
+        models.UniqueNullableModel.objects.create(title=None)
+        models.UniqueNullableModel.objects.create(title=None)
+
+        models.UniqueNullableModel.objects.create(title='')
+        self.assertRaises(IntegrityError, models.UniqueNullableModel.objects.create, title='')
+        models.UniqueNullableModel.objects.create(title='foo')
+        self.assertRaises(IntegrityError, models.UniqueNullableModel.objects.create, title='foo')
+
 
 class FallbackTests(ModeltranslationTestBase):
     test_fallback = {
diff --git a/modeltranslation/tests/models.py b/modeltranslation/tests/models.py
index 6f5d436..e55a2fa 100644
--- a/modeltranslation/tests/models.py
+++ b/modeltranslation/tests/models.py
@@ -16,6 +16,10 @@ class TestModel(models.Model):
     email = models.EmailField(blank=True, null=True)
 
 
+class UniqueNullableModel(models.Model):
+    title = models.CharField(null=True, unique=True, max_length=255)
+
+
 ########## Proxy model testing
 
 class ProxyTestModel(TestModel):
diff --git a/modeltranslation/tests/translation.py b/modeltranslation/tests/translation.py
index 4b44355..1b8b6c8 100644
--- a/modeltranslation/tests/translation.py
+++ b/modeltranslation/tests/translation.py
@@ -7,7 +7,7 @@ from modeltranslation.tests.models import (
     DescriptorModel, AbstractModelA, AbstractModelB, Slugged, MetaData, Displayable, Page,
     RichText, RichTextPage, MultitableModelA, MultitableModelB, MultitableModelC, ManagerTestModel,
     CustomManagerTestModel, CustomManager2TestModel, GroupFieldsetsModel, NameModel,
-    ThirdPartyRegisteredModel, ProxyTestModel)
+    ThirdPartyRegisteredModel, ProxyTestModel, UniqueNullableModel)
 
 
 class TestTranslationOptions(TranslationOptions):
@@ -15,6 +15,11 @@ class TestTranslationOptions(TranslationOptions):
 translator.register(TestModel, TestTranslationOptions)
 
 
+class UniqueNullableTranslationOptions(TranslationOptions):
+    fields = ('title',)
+translator.register(UniqueNullableModel, UniqueNullableTranslationOptions)
+
+
 ########## Proxy model testing
 
 class ProxyTestTranslationOptions(TranslationOptions):