diff --git a/mongoengine/queryset/queryset.py b/mongoengine/queryset/queryset.py
index bfb5a486..1739f05e 100644
--- a/mongoengine/queryset/queryset.py
+++ b/mongoengine/queryset/queryset.py
@@ -469,7 +469,8 @@ class QuerySet(object):
 
         .. versionadded:: 0.2
         """
-        return self.update(upsert=upsert, multi=False, write_concern=None, **update)
+        return self.update(
+            upsert=upsert, multi=False, write_concern=write_concern, **update)
 
     def with_id(self, object_id):
         """Retrieve the object matching the id provided.  Uses `object_id` only
diff --git a/tests/queryset/queryset.py b/tests/queryset/queryset.py
index dfaae850..13039f24 100644
--- a/tests/queryset/queryset.py
+++ b/tests/queryset/queryset.py
@@ -286,15 +286,19 @@ class QuerySetTest(unittest.TestCase):
             name='Test User', write_concern=write_concern)
         author.save(write_concern=write_concern)
 
-        self.Person.objects.update(set__name='Ross',
-                                   write_concern=write_concern)
+        result = self.Person.objects.update(
+            set__name='Ross',write_concern={"w": 1})
+        self.assertEqual(result, 1)
+        result = self.Person.objects.update(
+            set__name='Ross',write_concern={"w": 0})
+        self.assertEqual(result, None)
 
-        author = self.Person.objects.first()
-        self.assertEqual(author.name, 'Ross')
-
-        self.Person.objects.update_one(set__name='Test User', write_concern=write_concern)
-        author = self.Person.objects.first()
-        self.assertEqual(author.name, 'Test User')
+        result = self.Person.objects.update_one(
+            set__name='Test User', write_concern={"w": 1})
+        self.assertEqual(result, 1)
+        result = self.Person.objects.update_one(
+            set__name='Test User', write_concern={"w": 0})
+        self.assertEqual(result, None)
 
     def test_update_update_has_a_value(self):
         """Test to ensure that update is passed a value to update to"""