diff --git a/Lib/doctest.py b/Lib/doctest.py
index c5b0f4edf4e..8806d6e7f84 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -2211,7 +2211,7 @@ class DocTestCase(unittest.TestCase):
         self.setUp()
         runner = DebugRunner(optionflags=self._dt_optionflags,
                              checker=self._dt_checker, verbose=False)
-        runner.run(self._dt_test)
+        runner.run(self._dt_test, clear_globs=False)
         self.tearDown()
 
     def id(self):