diff --git a/Lib/tkinter/test/support.py b/Lib/tkinter/test/support.py
index 52df1040030..dd155fad0fd 100644
--- a/Lib/tkinter/test/support.py
+++ b/Lib/tkinter/test/support.py
@@ -23,7 +23,7 @@ class AbstractTkTest:
     def tearDownClass(cls):
         cls.root.update_idletasks()
         cls.root.destroy()
-        cls.root = None
+        del cls.root
         tkinter._default_root = None
         tkinter._support_default_root = cls._old_support_default_root
 
diff --git a/Lib/tkinter/test/test_tkinter/test_font.py b/Lib/tkinter/test/test_tkinter/test_font.py
index 25b59132add..c094c61ce42 100644
--- a/Lib/tkinter/test/test_tkinter/test_font.py
+++ b/Lib/tkinter/test/test_tkinter/test_font.py
@@ -12,7 +12,7 @@ class FontTest(AbstractTkTest, unittest.TestCase):
 
     @classmethod
     def setUpClass(cls):
-        AbstractTkTest.setUpClass()
+        AbstractTkTest.setUpClass.__func__(cls)
         try:
             cls.font = font.Font(root=cls.root, name=fontname, exists=True)
         except tkinter.TclError: