diff --git a/ops/nixos/lib/blade-router.nix b/ops/nixos/lib/blade-router.nix
index ab018b0e85..493d14d415 100644
--- a/ops/nixos/lib/blade-router.nix
+++ b/ops/nixos/lib/blade-router.nix
@@ -54,7 +54,7 @@ in
     linx.enable = mkEnableOption "linx";
     addresses.vl-linx.v4 = {
       addr = mkOption { type = types.str; default = "195.66.224.58"; };
-      prefixLength = mkOption { type = types.int; default = 22; };
+      prefixLength = mkOption { type = types.int; default = 21; };
     };
     addresses.vl-linx.v6 = {
       addr = mkOption { type = types.str; default = "2001:7f8:4::3:22a7:1"; };