diff --git a/Lib/test/test_urlparse.py b/Lib/test/test_urlparse.py
@@ -1079,7 +1079,8 @@ def test_urlsplit_normalization(self):
        hex_chars = {'{:04X}'.format(ord(c)) for c in illegal_chars}
        denorm_chars = [
            c for c in map(chr, range(128, sys.maxunicode))
-            if (hex_chars & set(unicodedata.decomposition(c).split()))
            and c not in illegal_chars
        ]
        # Sanity check that we found at least one such character