diff --git a/spec/focus/default.nix b/spec/focus/default.nix
index a161d860..d8e281fe 100644
--- a/spec/focus/default.nix
+++ b/spec/focus/default.nix
@@ -13,6 +13,7 @@
     fs.cryptsetup.allowDiscards = false;
     fs.cryptsetup.uuids.secret = "c2bc361e-6f9a-48fa-b698-ed3603a9664a";
     boot.lanzaboote = true;
+    boot.memtest = 4;
     acme.enable = true;
   };