diff --git a/p4app/test.py b/p4app/test.py
index 98918a6..7ef1112 100755
--- a/p4app/test.py
+++ b/p4app/test.py
@@ -27,7 +27,7 @@ class TestStuff(object):
 
     def test_v6_static_mapping(self):
         host = "h1"
-        nat64_prefix      = ipaddress.ip_network("64:ff9b::/96")
+        nat64_prefix      = ipaddress.ip_network("2001:db8:1::/96")
         dst_ipv4          = ipaddress.ip_address("10.0.0.1")
         translated_ipv4   = nat64_prefix[int(dst_ipv4)]