diff --git a/python/pb_unit_tests/descriptor_pool_test_wrapper.py b/python/pb_unit_tests/descriptor_pool_test_wrapper.py
index ea4b27332d..bc1de08400 100644
--- a/python/pb_unit_tests/descriptor_pool_test_wrapper.py
+++ b/python/pb_unit_tests/descriptor_pool_test_wrapper.py
@@ -24,11 +24,10 @@
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import unittest
+from google.protobuf.internal import api_implementation
 from google.protobuf.internal.descriptor_pool_test import *
 
-# This is testing that certain methods unconditionally throw TypeError.
-# In the new extension we simply don't define them at all.
-AddDescriptorTest.testAddTypeError.__unittest_expecting_failure__ = True
+AddDescriptorTest.testAddTypeError.__unittest_skip__ = True
 
 SecondaryDescriptorFromDescriptorDB.testErrorCollector.__unittest_expecting_failure__ = True