diff --git a/model_utils/managers.py b/model_utils/managers.py
index 1f01465..19a1425 100644
--- a/model_utils/managers.py
+++ b/model_utils/managers.py
@@ -70,6 +70,7 @@ class InheritanceQuerySet(QuerySet):
     def iterator(self):
         iter = super(InheritanceQuerySet, self).iterator()
         if getattr(self, 'subclasses', False):
+            extras = self.query.extra_select.keys()
             # sort the subclass names longest first,
             # so with 'a' and 'a__b' it goes as deep as possible
             subclasses = sorted(self.subclasses, key=len, reverse=True)
@@ -86,6 +87,9 @@ class InheritanceQuerySet(QuerySet):
                     for k in self._annotated:
                         setattr(sub_obj, k, getattr(obj, k))
 
+                for k in extras:
+                    setattr(sub_obj, k, getattr(obj, k))
+
                 yield sub_obj
         else:
             for obj in iter:
diff --git a/model_utils/tests/tests.py b/model_utils/tests/tests.py
index 070ba46..bbc0e37 100644
--- a/model_utils/tests/tests.py
+++ b/model_utils/tests/tests.py
@@ -974,6 +974,15 @@ class InheritanceManagerUsingModelsTests(TestCase):
         self.assertEqual(set(results.subclasses),
                          set(expected_related_names))
 
+    def test_extras_descend(self):
+        """
+        Ensure that if extras(select=) is passed, we copy the values down onto
+        sub classes.
+        """
+        results = InheritanceManagerTestParent.objects.all().extra(
+            select={'foo': 'id + 1'}
+        )
+        self.assertTrue(all(result.foo == (result.id + 1) for result in results))
 
 
 class InheritanceManagerRelatedTests(InheritanceManagerTests):