diff --git a/hosts/containers/nix-build/configuration.nix b/hosts/containers/nix-build/configuration.nix
index 0655ea6b..fc5ac813 100644
--- a/hosts/containers/nix-build/configuration.nix
+++ b/hosts/containers/nix-build/configuration.nix
@@ -6,9 +6,14 @@
   ];
 
   boot = {
-    loader.systemd-boot.enable = true;
-    loader.efi.efiSysMountPoint = "/boot";
+    loader = {
+      systemd-boot.enable = true;
+      efi.efiSysMountPoint = "/boot";
+    };
+
     tmpOnTmpfs = true;
+    cleanTmpDir = true;
+
     kernelModules = [ "kvm-intel" ];
     binfmt.emulatedSystems = [ "armv6l-linux" "armv7l-linux" "aarch64-linux" ];
   };