diff --git a/machines/sirius/disko.nix b/machines/sirius/disko.nix
index e96ce2f..c4bb866 100644
--- a/machines/sirius/disko.nix
+++ b/machines/sirius/disko.nix
@@ -16,8 +16,8 @@ in
     efi = {
       canTouchEfiVariables = true;
     };
-    tmp.useTmpfs = true;
   };
+  boot.tmp.useTmpfs = true;
 
   disko.devices = {
     disk = {