diff --git a/bird.conf b/bird.conf
index ec34162..5323088 100644
--- a/bird.conf
+++ b/bird.conf
@@ -50,6 +50,7 @@ function is_dn42() {
 function is_chaos() {
   return net ~ [ 10.4.0.0/16+,
     10.32.0.0/16+,
+    10.42.16.0/20+, # legacy
     10.100.0.0/14+,
     10.104.0.0/14+,
     172.31.0.0/16+,