diff --git a/nixos/tests/ifstate/initrd-wireguard.nix b/nixos/tests/ifstate/initrd-wireguard.nix
index 6eb90c49a829..7fe99a5a2646 100644
--- a/nixos/tests/ifstate/initrd-wireguard.nix
+++ b/nixos/tests/ifstate/initrd-wireguard.nix
@@ -10,19 +10,20 @@ let
     {
       enable = true;
       settings = {
-        interfaces = {
-          eth1 = {
-            addresses = [ "2001:0db8:a::${builtins.toString id}/64" ];
-            link = {
-              state = "up";
-              kind = "physical";
-            };
+        namespaces.outside.interfaces.eth1 = {
+          addresses = [ "2001:0db8:a::${builtins.toString id}/64" ];
+          link = {
+            state = "up";
+            kind = "physical";
           };
+        };
+        interfaces = {
           wg0 = {
             addresses = [ "2001:0db8:b::${builtins.toString id}/64" ];
             link = {
               state = "up";
               kind = "wireguard";
+              bind_netns = "outside";
             };
             wireguard = {
               private_key = "!include ${pkgs.writeText "wg_priv.key" wgPriv}";