diff --git a/nixos/modules/system/boot/loader/grub/grub.nix b/nixos/modules/system/boot/loader/grub/grub.nix
index fd6523c0ece..a166709d39a 100644
--- a/nixos/modules/system/boot/loader/grub/grub.nix
+++ b/nixos/modules/system/boot/loader/grub/grub.nix
@@ -34,7 +34,7 @@ let
       shell = "${pkgs.stdenv.shell}";
       fullVersion = (builtins.parseDrvName realGrub.name).version;
       grubEfi = f grubEfi;
-      grubTargetEfi = if cfg.efiSupport && (cfg.version == 2) then f grubEfi.grubTarget else "";
+      grubTargetEfi = if cfg.efiSupport && (cfg.version == 2) then f (grubEfi.grubTarget or "") else "";
       inherit (efi) efiSysMountPoint canTouchEfiVariables;
       inherit (cfg)
         version extraConfig extraPerEntryConfig extraEntries