diff --git a/modules/installer/cd-dvd/iso-image.nix b/modules/installer/cd-dvd/iso-image.nix
index 8117d8631f5b..e17dce4f71cc 100644
--- a/modules/installer/cd-dvd/iso-image.nix
+++ b/modules/installer/cd-dvd/iso-image.nix
@@ -72,7 +72,7 @@ let
   # The Grub image.
   grubImage = pkgs.runCommand "grub_eltorito" {}
     ''
-      ${pkgs.grub2}/bin/grub-mkimage -o tmp biosdisk iso9660 help linux linux16 sh chain gfxterm vbe png jpeg
+      ${pkgs.grub2}/bin/grub-mkimage -O i386-pc -o tmp biosdisk iso9660 help linux linux16 chain gfxterm vbe png jpeg
       cat ${pkgs.grub2}/lib/grub/*/cdboot.img tmp > $out
     ''; # */