2 files changed, 8 insertions, 0 deletions
diff --git a/tests/regressiontests/model_fields/models.py b/tests/regressiontests/model_fields/models.py
index 5e480aa9a5..72c7beb014 100644
--- a/tests/regressiontests/model_fields/models.py
+++ b/tests/regressiontests/model_fields/models.py
@@ -69,6 +69,7 @@ class NullBooleanModel(models.Model):
 
 class BooleanModel(models.Model):
     bfield = models.BooleanField()
+    string = models.CharField(max_length=10, default='abc')
 
 ###############################################################################
 # ImageField
diff --git a/tests/regressiontests/model_fields/tests.py b/tests/regressiontests/model_fields/tests.py
index 05b710d885..f0704ff941 100644
--- a/tests/regressiontests/model_fields/tests.py
+++ b/tests/regressiontests/model_fields/tests.py
@@ -191,6 +191,13 @@ class BooleanFieldTests(unittest.TestCase):
         self.assertTrue(isinstance(b4.nbfield, bool))
         self.assertEqual(b4.nbfield, False)
 
+        # http://code.djangoproject.com/ticket/13293
+        # Verify that when an extra clause exists, the boolean
+        # conversions are applied with an offset
+        b5 = BooleanModel.objects.all().extra(
+            select={'string_length': 'LENGTH(string)'})[0]
+        self.assertFalse(isinstance(b5.pk, bool))
+
 class ChoicesTests(django.test.TestCase):
     def test_choices_and_field_display(self):
         """