diff --git a/nix/lib/dns.nix b/nix/lib/dns.nix
index 475ed83..64d8080 100644
--- a/nix/lib/dns.nix
+++ b/nix/lib/dns.nix
@@ -17,7 +17,6 @@ rec {
     "78.20.172.in-addr.arpa"
     "79.20.172.in-addr.arpa"
     "99.22.172.in-addr.arpa"
-    "99.22.172.in-addr.arpa"
     "22.10.in-addr.arpa"
   ];
   dynamicReverseZones6 = [