diff --git a/nixos/tests/installer.nix b/nixos/tests/installer.nix
index f1e1788127cb..531d075d75cf 100644
--- a/nixos/tests/installer.nix
+++ b/nixos/tests/installer.nix
@@ -1276,6 +1276,7 @@ in
   separateBootZfs = makeInstallerTest "separateBootZfs" {
     extraInstallerConfig = {
       boot.supportedFilesystems = [ "zfs" ];
+      networking.hostId = "00000000";
     };
 
     extraConfig = ''
@@ -1348,6 +1349,7 @@ in
   zfsroot = makeInstallerTest "zfs-root" {
     extraInstallerConfig = {
       boot.supportedFilesystems = [ "zfs" ];
+      networking.hostId = "00000000";
     };
 
     extraConfig = ''