1 files changed, 3 insertions, 2 deletions
diff --git a/nixos/modules/system/boot/loader/grub/grub.nix b/nixos/modules/system/boot/loader/grub/grub.nix
index 2e497ff9f2c4..42da65857221 100644
--- a/nixos/modules/system/boot/loader/grub/grub.nix
+++ b/nixos/modules/system/boot/loader/grub/grub.nix
@@ -385,8 +385,9 @@ in
       };
 
       default = mkOption {
-        default = 0;
-        type = types.int;
+        default = "0";
+        type = types.either types.int types.str;
+        apply = toString;
         description = ''
           Index of the default menu item to be booted.
         '';