diff --git a/nixos/boxes/colony/vms/shill/default.nix b/nixos/boxes/colony/vms/shill/default.nix
index 73ac394..c63b3b9 100644
--- a/nixos/boxes/colony/vms/shill/default.nix
+++ b/nixos/boxes/colony/vms/shill/default.nix
@@ -76,6 +76,11 @@
               };
             };
 
+            nix.settings = {
+              # Exclude S3 cache that we're right next to
+              substituters = mkForce [ "https://cache.nixos.org" ];
+            };
+
             services = {
               fstrim.enable = true;
               netdata.enable = true;