diff --git a/tests/expressions/tests.py b/tests/expressions/tests.py
index a8897fa069..fb9fd3d1e2 100644
--- a/tests/expressions/tests.py
+++ b/tests/expressions/tests.py
@@ -285,7 +285,7 @@ class BasicExpressionsTests(TestCase):
 
         test_gmbh.point_of_contact = self.gmbh.ceo
         test_gmbh.save()
-        test_gmbh.name = F('ceo__last_name')
+        test_gmbh.name = F('ceo__lastname')
         msg = 'Joined field references are not permitted in this query'
         with self.assertRaisesMessage(FieldError, msg):
             test_gmbh.save()