diff --git a/boxes/copernicus/default.nix b/boxes/copernicus/default.nix
index 4bd2925..3dd9161 100644
--- a/boxes/copernicus/default.nix
+++ b/boxes/copernicus/default.nix
@@ -46,6 +46,7 @@
     dunst
     libnotify
     ffmpeg
+    mdadm
 
     (pkgs.callPackage ../../builds/archutils.nix {})
   ];