diff --git a/flake.nix b/flake.nix
index 06b9ade8..e662ed89 100644
--- a/flake.nix
+++ b/flake.nix
@@ -266,12 +266,15 @@
         nix.package = pkgs.nixUnstable;
 
         # Set the configurations for the package manager.
-        nix.settings = {
-          # Set several binary caches.
+        nix.settings = let
           substituters = [
             "https://nix-community.cachix.org"
             "https://foo-dogsquared.cachix.org"
           ];
+        in {
+          # Set several binary caches.
+          inherit substituters;
+          trusted-substituters = substituters;
           trusted-public-keys = [
             "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
             "foo-dogsquared.cachix.org-1:/2fmqn/gLGvCs5EDeQmqwtus02TUmGy0ZlAEXqRE70E="