fix spelling
diff --git a/Lib/test/test_py3kwarn.py b/Lib/test/test_py3kwarn.py
index e6d38f2..07d5b34 100644
--- a/Lib/test/test_py3kwarn.py
+++ b/Lib/test/test_py3kwarn.py
@@ -133,7 +133,7 @@
                    'Also, note the returned format is different.'
         with catch_warning() as w:
             self.assertWarning(oct(Spam()), w, expected)
-        expected = 'In 3.x, hex() converts the result of __index__ to hexidecimal.'
+        expected = 'In 3.x, hex() converts the result of __index__ to hexadecimal.'
         with catch_warning() as w:
             self.assertWarning(hex(Spam()), w, expected)