diff --git a/Lib/test/test_array.py b/Lib/test/test_array.py
index 012078044bd..3fdd420e91b 100755
--- a/Lib/test/test_array.py
+++ b/Lib/test/test_array.py
@@ -143,7 +143,7 @@ def test_error(self):
         self.assertRaises(ValueError, array_reconstructor,
                           array.array, "b", UNKNOWN_FORMAT, b"")
         self.assertRaises(ValueError, array_reconstructor,
-                          array.array, "b", 22, b"")
+                          array.array, "b", MACHINE_FORMAT_CODE_MAX + 1, b"")
         self.assertRaises(ValueError, array_reconstructor,
                           array.array, "d", 16, b"a")