diff --git a/modules/remotebuild/client.nix b/modules/remotebuild/client.nix
index 7a52006..3644a62 100644
--- a/modules/remotebuild/client.nix
+++ b/modules/remotebuild/client.nix
@@ -9,12 +9,20 @@
     sshKey = "/root/.ssh/nixremote";
     supportedFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
   in
-  [ {
-    #buildOptions ++ hostName = "mc7";
-    inherit system protocol sshUser sshKey supportedFeatures;
-    hostName = "mc7";
-  }];
+  [
+    {
+      inherit system protocol sshUser sshKey supportedFeatures;
+      hostName = "mc7";
+    }
+    {
+      inherit system protocol sshUser sshKey supportedFeatures;
+      hostName = "mc6";
+    }
+  ];
 
   nix.distributedBuilds = true;
+  nix.extraOptions = ''
+    builders-use-substitutes = true
+  '';
 }
 # vim: set et ts=2 sw=2 ai: