diff --git a/nixos/tests/initrd-luks-empty-passphrase.nix b/nixos/tests/initrd-luks-empty-passphrase.nix
index d2805f2f173..521456e7e0b 100644
--- a/nixos/tests/initrd-luks-empty-passphrase.nix
+++ b/nixos/tests/initrd-luks-empty-passphrase.nix
@@ -18,6 +18,11 @@ in {
       emptyDiskImages = [ 512 ];
       useBootLoader = true;
       useEFIBoot = true;
+      # This requires to have access
+      # to a host Nix store as
+      # the new root device is /dev/vdb
+      # an empty 512MiB drive, containing no Nix store.
+      mountHostNixStore = true;
     };
 
     boot.loader.systemd-boot.enable = true;
diff --git a/nixos/tests/luks.nix b/nixos/tests/luks.nix
index c2b95c6a95f..d5ac550a3c5 100644
--- a/nixos/tests/luks.nix
+++ b/nixos/tests/luks.nix
@@ -7,6 +7,8 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
       emptyDiskImages = [ 512 512 ];
       useBootLoader = true;
       useEFIBoot = true;
+      # To boot off the encrypted disk, we need to have a init script which comes from the Nix store
+      mountHostNixStore = true;
     };
     boot.loader.systemd-boot.enable = true;
 
diff --git a/nixos/tests/lvm2/systemd-stage-1.nix b/nixos/tests/lvm2/systemd-stage-1.nix
index b711cd22d7f..b581f2b2350 100644
--- a/nixos/tests/lvm2/systemd-stage-1.nix
+++ b/nixos/tests/lvm2/systemd-stage-1.nix
@@ -65,6 +65,8 @@ in import ../make-test-python.nix ({ pkgs, ... }: {
       emptyDiskImages = [ 8192 8192 ];
       useBootLoader = true;
       useEFIBoot = true;
+      # To boot off the LVM disk, we need to have a init script which comes from the Nix store.
+      mountHostNixStore = true;
     };
     boot.loader.systemd-boot.enable = true;
     boot.loader.efi.canTouchEfiVariables = true;
diff --git a/nixos/tests/systemd-initrd-btrfs-raid.nix b/nixos/tests/systemd-initrd-btrfs-raid.nix
index c9cdf0060b1..9196033789c 100644
--- a/nixos/tests/systemd-initrd-btrfs-raid.nix
+++ b/nixos/tests/systemd-initrd-btrfs-raid.nix
@@ -6,6 +6,8 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
     virtualisation = {
       emptyDiskImages = [ 512 512 ];
       useBootLoader = true;
+      # Booting off the BTRFS RAID requires an available init script from the Nix store
+      mountHostNixStore = true;
       useEFIBoot = true;
     };
     boot.loader.systemd-boot.enable = true;
diff --git a/nixos/tests/systemd-initrd-luks-fido2.nix b/nixos/tests/systemd-initrd-luks-fido2.nix
index e80d95f79c7..32c79b731d8 100644
--- a/nixos/tests/systemd-initrd-luks-fido2.nix
+++ b/nixos/tests/systemd-initrd-luks-fido2.nix
@@ -6,6 +6,8 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
     virtualisation = {
       emptyDiskImages = [ 512 ];
       useBootLoader = true;
+      # Booting off the encrypted disk requires having a Nix store available for the init script
+      mountHostNixStore = true;
       useEFIBoot = true;
       qemu.package = lib.mkForce (pkgs.qemu_test.override { canokeySupport = true; });
       qemu.options = [ "-device canokey,file=/tmp/canokey-file" ];
diff --git a/nixos/tests/systemd-initrd-luks-keyfile.nix b/nixos/tests/systemd-initrd-luks-keyfile.nix
index 257243d92a1..5ca0f48c333 100644
--- a/nixos/tests/systemd-initrd-luks-keyfile.nix
+++ b/nixos/tests/systemd-initrd-luks-keyfile.nix
@@ -14,6 +14,8 @@ in {
     virtualisation = {
       emptyDiskImages = [ 512 ];
       useBootLoader = true;
+      # Necessary to boot off the encrypted disk because it requires a init script coming from the Nix store
+      mountHostNixStore = true;
       useEFIBoot = true;
     };
     boot.loader.systemd-boot.enable = true;
diff --git a/nixos/tests/systemd-initrd-luks-password.nix b/nixos/tests/systemd-initrd-luks-password.nix
index 2dd3f304e82..a90a59feed6 100644
--- a/nixos/tests/systemd-initrd-luks-password.nix
+++ b/nixos/tests/systemd-initrd-luks-password.nix
@@ -6,6 +6,8 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
     virtualisation = {
       emptyDiskImages = [ 512 512 ];
       useBootLoader = true;
+      # Booting off the encrypted disk requires an available init script
+      mountHostNixStore = true;
       useEFIBoot = true;
     };
     boot.loader.systemd-boot.enable = true;
diff --git a/nixos/tests/systemd-initrd-luks-tpm2.nix b/nixos/tests/systemd-initrd-luks-tpm2.nix
index 734ef38579f..73aa190ad62 100644
--- a/nixos/tests/systemd-initrd-luks-tpm2.nix
+++ b/nixos/tests/systemd-initrd-luks-tpm2.nix
@@ -6,6 +6,8 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
     virtualisation = {
       emptyDiskImages = [ 512 ];
       useBootLoader = true;
+      # Booting off the TPM2-encrypted device requires an available init script
+      mountHostNixStore = true;
       useEFIBoot = true;
       qemu.options = ["-chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock -tpmdev emulator,id=tpm0,chardev=chrtpm -device tpm-tis,tpmdev=tpm0"];
     };
diff --git a/nixos/tests/systemd-initrd-networkd-ssh.nix b/nixos/tests/systemd-initrd-networkd-ssh.nix
index 943552613be..46dbdf53739 100644
--- a/nixos/tests/systemd-initrd-networkd-ssh.nix
+++ b/nixos/tests/systemd-initrd-networkd-ssh.nix
@@ -10,13 +10,15 @@ import ./make-test-python.nix ({ lib, ... }: {
       virtualisation = {
         emptyDiskImages = [ 4096 ];
         useBootLoader = true;
+        # Booting off the encrypted disk requires an available init script from the Nix store
+        mountHostNixStore = true;
         useEFIBoot = true;
       };
 
       specialisation.encrypted-root.configuration = {
-        virtualisation.bootDevice = "/dev/mapper/root";
+        virtualisation.rootDevice = "/dev/mapper/root";
         boot.initrd.luks.devices = lib.mkVMOverride {
-          root.device = "/dev/vdc";
+          root.device = "/dev/vdb";
         };
         boot.initrd.systemd.enable = true;
         boot.initrd.network = {
@@ -61,7 +63,7 @@ import ./make-test-python.nix ({ lib, ... }: {
 
     server.wait_for_unit("multi-user.target")
     server.succeed(
-        "echo somepass | cryptsetup luksFormat --type=luks2 /dev/vdc",
+        "echo somepass | cryptsetup luksFormat --type=luks2 /dev/vdb",
         "bootctl set-default nixos-generation-1-specialisation-encrypted-root.conf",
         "sync",
     )
diff --git a/nixos/tests/systemd-initrd-swraid.nix b/nixos/tests/systemd-initrd-swraid.nix
index d201ba99a20..0d5a1c6354d 100644
--- a/nixos/tests/systemd-initrd-swraid.nix
+++ b/nixos/tests/systemd-initrd-swraid.nix
@@ -6,6 +6,8 @@ import ./make-test-python.nix ({ lib, pkgs, ... }: {
     virtualisation = {
       emptyDiskImages = [ 512 512 ];
       useBootLoader = true;
+      # Booting off the RAID requires an available init script
+      mountHostNixStore = true;
       useEFIBoot = true;
     };
     boot.loader.systemd-boot.enable = true;