diff --git a/Lib/lib-tk/test/test_ttk/support.py b/Lib/lib-tk/test/test_ttk/support.py
index a9d651c..c335f29 100644
--- a/Lib/lib-tk/test/test_ttk/support.py
+++ b/Lib/lib-tk/test/test_ttk/support.py
@@ -20,6 +20,7 @@
 
     @classmethod
     def tearDownClass(cls):
+        cls.root.update_idletasks()
         cls.root.destroy()
         cls.root = None
         tkinter._default_root = None