diff --git a/nix/nixos-module/network.nix b/nix/nixos-module/network.nix
index a2d64dc..cce7499 100644
--- a/nix/nixos-module/network.nix
+++ b/nix/nixos-module/network.nix
@@ -37,7 +37,7 @@ in
           matchConfig.Name = ifName;
 
           networkConfig.IPForward =
-            (builtins.length addresses) > 0;
+            config.site.hosts.${hostName}.isRouter;
 
           addresses =
             let