diff --git a/ipv6/us.cidr b/ipv6/us.cidr
index 54fc8943f..06889a5ca 100644
--- a/ipv6/us.cidr
+++ b/ipv6/us.cidr
@@ -1538,7 +1538,7 @@
 2602:f7a7::/40
 2602:f7a8::/40
 2602:f7a9::/36
-2602:f7aa::/40
+2602:f7aa::/36
 2602:f7ab::/36
 2602:f7ac::/36
 2602:f7ad::/36