diff --git a/templates/nix-config/disks/mirror.nix b/templates/nix-config/disks/mirror.nix
index cd0e593..c5e196b 100644
--- a/templates/nix-config/disks/mirror.nix
+++ b/templates/nix-config/disks/mirror.nix
@@ -36,7 +36,6 @@
         type = "mdadm";
         level = 1;
         metadata = "1.2";
-        bitmap = "internal";
         content = {
           type = "luks";
           name = "crypted-mirror";