diff --git a/systems/x86_64-linux/dimondback/default.nix b/systems/x86_64-linux/dimondback/default.nix
index c658a02..979bd5e 100644
--- a/systems/x86_64-linux/dimondback/default.nix
+++ b/systems/x86_64-linux/dimondback/default.nix
@@ -27,6 +27,7 @@ in {
 
   custom.presets.disko.ext4 = {
     enable = true;
+    device = "/dev/sda";
   };
   custom.presets.default = enabled;
   custom.hardware.bluetooth.enable = true;