diff --git a/testing/tests/ikev2/nat-two-rw/hosts/sun/etc/ipsec.conf b/testing/tests/ikev2/nat-two-rw/hosts/sun/etc/ipsec.conf
index 43c4f0717..8a289fd7d 100755
--- a/testing/tests/ikev2/nat-two-rw/hosts/sun/etc/ipsec.conf
+++ b/testing/tests/ikev2/nat-two-rw/hosts/sun/etc/ipsec.conf
@@ -30,5 +30,5 @@ conn host-host
 conn nat-t
 	leftsubnet=10.2.0.0/16
 	right=%any
-	rightsubnetwithin=10.1.0.0/16
+	rightsubnet=10.1.0.0/16
 	auto=add