diff --git a/nixos/boxes/foureighty.nix b/nixos/boxes/foureighty.nix
index 44908f90..dd2488a8 100644
--- a/nixos/boxes/foureighty.nix
+++ b/nixos/boxes/foureighty.nix
@@ -32,6 +32,7 @@
     loader.efi.canTouchEfiVariables = true;
   };
 
+  time.hardwareClockInLocalTime = true;
   time.timeZone = "Europe/London";
 
   hardware.bumblebee.enable = true;
@@ -73,16 +74,11 @@
     ];
   };
 
-  virtualisation.virtualbox.host = {
-    enable = true;
-    enableExtensionPack = true;
-    enableHardening = false; #needed for 3D acceleration
-  };
-
   imports = [
     /etc/nixos/hardware-configuration.nix
     ../boot.nix
     ../common.nix 
     ../gfx-intel.nix
+    ../virtualbox.nix
   ];
 }
diff --git a/nixos/boxes/skinnyv.nix b/nixos/boxes/skinnyv.nix
index a53b3586..16627eb2 100644
--- a/nixos/boxes/skinnyv.nix
+++ b/nixos/boxes/skinnyv.nix
@@ -20,16 +20,11 @@
   };
   time.timeZone = "Europe/London";
 
-  virtualisation.virtualbox.host = {
-    enable = true;
-    enableExtensionPack = true;
-    enableHardening = false; #needed for 3D acceleration
-  };
-
   imports = [
     /etc/nixos/hardware-configuration.nix
     ../boot.nix
     ../common.nix 
     ../gfx-intel.nix
+    ../virtualbox.nix
   ];
 }
diff --git a/nixos/virtualbox.nix b/nixos/virtualbox.nix
new file mode 100644
index 00000000..e49a918b
--- /dev/null
+++ b/nixos/virtualbox.nix
@@ -0,0 +1,17 @@
+{ config, pkgs, ... }:
+let
+  unstableTarball = fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz;
+in
+{
+  nixpkgs.config = {
+    packageOverrides = pkgs: {
+      unstable = import unstableTarball {
+        config = config.nixpkgs.config;
+      };
+    };
+  };
+  virtualisation.virtualbox.host = {
+    enable = true;
+    enableExtensionPack = true;
+  };
+}