diff --git a/tests/regressiontests/model_fields/tests.py b/tests/regressiontests/model_fields/tests.py
index 6d210b1ffb..d47344d644 100644
--- a/tests/regressiontests/model_fields/tests.py
+++ b/tests/regressiontests/model_fields/tests.py
@@ -163,7 +163,7 @@ class ValidationTest(django.test.TestCase):
         self.assertRaises(ValidationError, f.clean, "a", None)
 
     def test_charfield_with_choices_cleans_valid_choice(self):
-        f = models.CharField(choices=[('a','A'), ('b','B')])
+        f = models.CharField(max_length=1, choices=[('a','A'), ('b','B')])
         self.assertEqual('a', f.clean('a', None))
 
     def test_charfield_with_choices_raises_error_on_invalid_choice(self):