diff --git a/modules/nixos/base/nix.nix b/modules/nixos/base/nix.nix
index d79ed4e..fcf15c7 100644
--- a/modules/nixos/base/nix.nix
+++ b/modules/nixos/base/nix.nix
@@ -48,6 +48,7 @@ in {
       auto-optimise-store = true;
       warn-dirty = false;
       # cache
+      builders-use-substitutes = true;
       substituters = [
         "https://cache.nixos.org?priority=10"
         "https://nix-community.cachix.org"