diff --git a/Lib/test/test_zipimport_support.py b/Lib/test/test_zipimport_support.py
--- a/Lib/test/test_zipimport_support.py
+++ b/Lib/test/test_zipimport_support.py
@@ -159,8 +159,6 @@
                 test_zipped_doctest.test_DocTestRunner.verbose_flag,
                 test_zipped_doctest.test_Example,
                 test_zipped_doctest.test_debug,
-                test_zipped_doctest.test_pdb_set_trace,
-                test_zipped_doctest.test_pdb_set_trace_nested,
                 test_zipped_doctest.test_testsource,
                 test_zipped_doctest.test_trailing_space_in_test,
                 test_zipped_doctest.test_DocTestSuite,
@@ -173,6 +171,10 @@
                 test_zipped_doctest.test_testfile,
                 test_zipped_doctest.test_unittest_reportflags,
             ]
+            # Skip test_zipped_doctest.test_pdb_set_trace and
+            # test_zipped_doctest.test_pdb_set_trace_nested as they are
+            # conditional on no trace function being set.
+
             for obj in known_good_tests:
                 _run_object_doctest(obj, test_zipped_doctest)