diff --git a/nixos/tests/systemd-initrd-luks-password.nix b/nixos/tests/systemd-initrd-luks-password.nix
index e8e651f7b35f..55d0b4324b40 100644
--- a/nixos/tests/systemd-initrd-luks-password.nix
+++ b/nixos/tests/systemd-initrd-luks-password.nix
@@ -23,6 +23,8 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
         cryptroot2.device = "/dev/vdd";
       };
       virtualisation.bootDevice = "/dev/mapper/cryptroot";
+      # test mounting device unlocked in initrd after switching root
+      virtualisation.fileSystems."/cryptroot2".device = "/dev/mapper/cryptroot2";
     };
   };
 
@@ -31,6 +33,8 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
     machine.wait_for_unit("multi-user.target")
     machine.succeed("echo -n supersecret | cryptsetup luksFormat -q --iter-time=1 /dev/vdc -")
     machine.succeed("echo -n supersecret | cryptsetup luksFormat -q --iter-time=1 /dev/vdd -")
+    machine.succeed("echo -n supersecret | cryptsetup luksOpen   -q               /dev/vdd cryptroot2")
+    machine.succeed("mkfs.ext4 /dev/mapper/cryptroot2")
 
     # Boot from the encrypted disk
     machine.succeed("bootctl set-default nixos-generation-1-specialisation-boot-luks.conf")
@@ -44,5 +48,6 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
     machine.wait_for_unit("multi-user.target")
 
     assert "/dev/mapper/cryptroot on / type ext4" in machine.succeed("mount")
+    assert "/dev/mapper/cryptroot2 on /cryptroot2 type ext4" in machine.succeed("mount")
   '';
 })