diff --git a/Lib/test/test_normalization.py b/Lib/test/test_normalization.py
index 8a361fd..81bdfbd 100644
--- a/Lib/test/test_normalization.py
+++ b/Lib/test/test_normalization.py
@@ -7,7 +7,7 @@
 TESTDATAFILE = "NormalizationTest" + os.extsep + "txt"
 TESTDATAURL = "http://www.unicode.org/Public/4.1.0/ucd/" + TESTDATAFILE
 
-class RangeError:
+class RangeError(Exception):
     pass
 
 def NFC(str):