diff --git a/machines/core/nix.nix b/machines/core/nix.nix
index 90808a3..a886ee8 100644
--- a/machines/core/nix.nix
+++ b/machines/core/nix.nix
@@ -10,6 +10,7 @@
         "@wheel"
       ];
       auto-optimise-store = true;
+      builders-use-substitutes = true;
     };
 
     gc = {