diff --git a/Lib/test/test_string/test_templatelib.py b/Lib/test/test_string/test_templatelib.py
index 5cf187828510c4..5221ca673b24ec 100644
--- a/Lib/test/test_string/test_templatelib.py
+++ b/Lib/test/test_string/test_templatelib.py
@@ -18,6 +18,13 @@ def test_common(self):
         self.assertEqual(type(i).__qualname__, 'Interpolation')
         self.assertEqual(type(i).__module__, 'string.templatelib')
 
+    def test_final_types(self):
+        with self.assertRaisesRegex(TypeError, 'is not an acceptable base type'):
+            class Sub(Template): ...
+
+        with self.assertRaisesRegex(TypeError, 'is not an acceptable base type'):
+            class Sub(Interpolation): ...
+
     def test_basic_creation(self):
         # Simple t-string creation
         t = t'Hello, world'