diff --git a/nix/hosts/cc-ci-hetzner/networking.nix b/nix/hosts/cc-ci-hetzner/networking.nix
index 6d9a629..e2c58a1 100644
--- a/nix/hosts/cc-ci-hetzner/networking.nix
+++ b/nix/hosts/cc-ci-hetzner/networking.nix
@@ -15,10 +15,9 @@
       "185.12.64.2"
     ];
     defaultGateway = "172.31.1.1";
-    defaultGateway6 = {
-      address = "";
-      interface = "eth0";
-    };
+    # No IPv6 on this Hetzner instance (link-local only) — nixos-infect emitted an empty
+    # defaultGateway6/ipv6.route which made network-addresses-eth0.service fail
+    # ("ip route add /128" with no prefix). v4-only box, so no IPv6 gateway/route declared.
     dhcpcd.enable = false;
     usePredictableInterfaceNames = lib.mkForce false;
     interfaces = {
@@ -26,11 +25,7 @@
         ipv4.addresses = [
           { address = "91.98.47.73"; prefixLength = 32; }
         ];
-        ipv6.addresses = [
-          { address = "fe80::9000:8ff:fe04:152e"; prefixLength = 64; }
-        ];
         ipv4.routes = [{ address = "172.31.1.1"; prefixLength = 32; }];
-        ipv6.routes = [{ address = ""; prefixLength = 128; }];
       };
     };
   };