diff --git a/modules/virtualisation/virtualbox-guest.nix b/modules/virtualisation/virtualbox-guest.nix
index d0935d9a052..8e09d79e3a4 100644
--- a/modules/virtualisation/virtualbox-guest.nix
+++ b/modules/virtualisation/virtualbox-guest.nix
@@ -73,7 +73,10 @@ if (pkgs.stdenv.isi686 || pkgs.stdenv.isx86_64) then
         # should restrict this to logged-in users.
         KERNEL=="vboxuser",  OWNER="root", GROUP="root", MODE="0666"
       '';
-      
+
+    # Make the ACPI Shutdown command to do the right thing.    
+    services.acpid.enable = true;
+    services.acpid.powerEventCommands = "poweroff";
   };
 
 }