diff --git a/formats/raw-efi.nix b/formats/raw-efi.nix
index 4146903f..e566e0af 100644
--- a/formats/raw-efi.nix
+++ b/formats/raw-efi.nix
@@ -13,7 +13,7 @@
     fsType = "vfat";
   };
 
-  system.build.raw = lib.mkOverride 999 (import "${toString modulesPath}/../lib/make-disk-image.nix" {
+  system.build.raw = lib.mkOverride 99 (import "${toString modulesPath}/../lib/make-disk-image.nix" {
     inherit lib config pkgs;
     partitionTableType = "efi";
     diskSize = "auto";