diff --git a/Deployments/hydra.nix b/Deployments/hydra.nix
index 5e2fe73..9d0cced 100644
--- a/Deployments/hydra.nix
+++ b/Deployments/hydra.nix
@@ -35,7 +35,6 @@
     useSubstitutes = true;
     hydraURL = "https://hydra.mcwhirter.io";
     notificationSender = "hydra.mcwhirter.io";
-    buildMachinesFiles = [];
     extraConfig = ''
       store_uri = file:///var/lib/hydra/cache?secret-key=/etc/nix/hydra.mcwhirter.io/secret
       binary_cache_secret_key_file = /etc/nix/hydra.mcwhirter.io/secret
@@ -86,10 +85,10 @@
     {
       hostName = "localhost";
       systems = [ "x86_64-linux" "i686-linux" ];
-      maxJobs = 6;
+      maxJobs = 4;
       # for building VirtualBox VMs as build artifacts, you might need other
       # features depending on what you are doing
-      supportedFeatures = [ ];
+      supportedFeatures = [ "big-parallel" "kvm" "nixos-test" ];
     }
   ];
 }