diff --git a/Lib/test/test_ipaddress.py b/Lib/test/test_ipaddress.py
index 39eb9a13689..56f0be3ae8a 100644
--- a/Lib/test/test_ipaddress.py
+++ b/Lib/test/test_ipaddress.py
@@ -1740,7 +1740,6 @@ def testCompressIPv6Address(self):
             '2001:0:0:4:0:0:0:8': '2001:0:0:4::8/128',
             '2001:0:0:4:5:6:7:8': '2001::4:5:6:7:8/128',
             '2001:0:3:4:5:6:7:8': '2001:0:3:4:5:6:7:8/128',
-            '2001:0:3:4:5:6:7:8': '2001:0:3:4:5:6:7:8/128',
             '0:0:3:0:0:0:0:ffff': '0:0:3::ffff/128',
             '0:0:0:4:0:0:0:ffff': '::4:0:0:0:ffff/128',
             '0:0:0:0:5:0:0:ffff': '::5:0:0:ffff/128',