diff --git a/hosts/buildbox/disko-config.nix b/hosts/buildbox/disko-config.nix
index 51fee39..91d1bf8 100644
--- a/hosts/buildbox/disko-config.nix
+++ b/hosts/buildbox/disko-config.nix
@@ -15,14 +15,14 @@
           partitions = {
             # GRUB's core.img lives here on GPT/BIOS systems (GPT leaves no
             # gap after the MBR, so grub-install needs an EF02 partition).
-            # Not mounted; grub-install writes the boot code directly.
+            # No `content` block — this partition holds raw GRUB boot code,
+            # not a filesystem. disko also derives boot.loader.grub.devices
+            # from this partition automatically.
+            # See: https://github.com/nix-community/disko/blob/master/example/gpt-bios-compat.nix
             boot = {
               size = "1M";
               type = "EF02";
-              content = {
-                type = "filesystem";
-                format = "empty";
-              };
+              attributes = [0];
             };
             root = {
               size = "100%";