diff --git a/Lib/test/test_bool.py b/Lib/test/test_bool.py
index 34ecb45f1..dcdf7bdce 100644
--- a/Lib/test/test_bool.py
+++ b/Lib/test/test_bool.py
@@ -383,6 +383,10 @@ class BoolTest(unittest.TestCase):
             __bool__ = None
         self.assertRaises(TypeError, bool, B())
 
+        class C:
+            __len__ = None
+        self.assertRaises(TypeError, bool, C())
+
     def test_real_and_imag(self):
         self.assertEqual(True.real, 1)
         self.assertEqual(True.imag, 0)