diff --git a/Lib/test/test_property.py b/Lib/test/test_property.py
index 5addd36..057d1d3 100644
--- a/Lib/test/test_property.py
+++ b/Lib/test/test_property.py
@@ -170,8 +170,10 @@ class PropertyTests(unittest.TestCase):
     def test_property_decorator_doc_writable(self):
         sub = PropertyWritableDoc()
         self.assertEqual(sub.__class__.spam.__doc__, 'Eggs')
+        orig_doc = sub.__class__.spam.__doc__
         sub.__class__.spam.__doc__ = 'Spam'
         self.assertEqual(sub.__class__.spam.__doc__, 'Spam')
+        sub.__class__.spam.__doc__ = orig_doc
 
 # Issue 5890: subclasses of property do not preserve method __doc__ strings
 class PropertySub(property):