diff --git a/hosts/fra1-c/configuration.nix b/hosts/fra1-c/configuration.nix
index 2ad1a5c..c2713ad 100644
--- a/hosts/fra1-c/configuration.nix
+++ b/hosts/fra1-c/configuration.nix
@@ -24,7 +24,7 @@ in
   boot = {
     loader.grub = {
       enable = true;
-      device = [ disk ];
+      device = disk;
     };
     initrd = {
       kernelModules = [ "usb_storage" ];