diff --git a/nix/modules/lanzaboote.nix b/nix/modules/lanzaboote.nix
index 2339a0e5..7c21347e 100644
--- a/nix/modules/lanzaboote.nix
+++ b/nix/modules/lanzaboote.nix
@@ -126,7 +126,7 @@ in
         ${optionalString cfg.enrollKeys ''
           mkdir -p /tmp/pki
           cp -r ${cfg.pkiBundle}/* /tmp/pki
-          ${sbctlWithPki}/bin/sbctl enroll-keys --yes-this-might-brick-my-machine
+          ${lib.getExe sbctlWithPki} enroll-keys --yes-this-might-brick-my-machine
         ''}
 
         # Use the system from the kernel's hostPlatform because this should
@@ -163,7 +163,7 @@ in
       # Place the fwupd efi files in /run and sign them
       script = ''
         ln -sf ${config.services.fwupd.package.fwupd-efi}/libexec/fwupd/efi/fwupd*.efi /run/fwupd-efi/
-        ${pkgs.sbsigntool}/bin/sbsign --key '${cfg.privateKeyFile}' --cert '${cfg.publicKeyFile}' /run/fwupd-efi/fwupd*.efi
+        ${lib.getExe' pkgs.sbsigntool "sbsign"} --key '${cfg.privateKeyFile}' --cert '${cfg.publicKeyFile}' /run/fwupd-efi/fwupd*.efi
       '';
     };