diff --git a/nixos/modules/installer/cd-dvd/iso-image.nix b/nixos/modules/installer/cd-dvd/iso-image.nix
index 35afdc3a3f76..e49159c5964f 100644
--- a/nixos/modules/installer/cd-dvd/iso-image.nix
+++ b/nixos/modules/installer/cd-dvd/iso-image.nix
@@ -865,7 +865,7 @@ in
 
     # Don't build the GRUB menu builder script, since we don't need it
     # here and it causes a cyclic dependency.
-    boot.loader.grub.enable = false;
+    boot.loader.grub.enable = lib.mkImageMediaOverride false;
 
     environment.systemPackages = [
       grubPkgs.grub2