diff --git a/nixos/modules/system/boot/loader/systemd-boot/systemd-boot.nix b/nixos/modules/system/boot/loader/systemd-boot/systemd-boot.nix
index c07567ec82ea..1a1dcaea9c89 100644
--- a/nixos/modules/system/boot/loader/systemd-boot/systemd-boot.nix
+++ b/nixos/modules/system/boot/loader/systemd-boot/systemd-boot.nix
@@ -33,7 +33,7 @@ let
     netbootxyz = if cfg.netbootxyz.enable then pkgs.netbootxyz-efi else "";
 
     copyExtraFiles = pkgs.writeShellScript "copy-extra-files" ''
-      empty_file=$(mktemp)
+      empty_file=$(${pkgs.coreutils}/bin/mktemp)
 
       ${concatStrings (mapAttrsToList (n: v: ''
         ${pkgs.coreutils}/bin/install -Dp "${v}" "${efi.efiSysMountPoint}/"${escapeShellArg n}