diff --git a/machines/universedesktop/ccache.nix b/machines/universedesktop/ccache.nix
index 528c24e..690f115 100644
--- a/machines/universedesktop/ccache.nix
+++ b/machines/universedesktop/ccache.nix
@@ -1,8 +1,8 @@
 { config, pkgs, lib, ... }: {
-nixpkgs.overlays = [
-  (self: super: {
-    ccacheWrapper = super.ccacheWrapper.override {
-      extraConfig = ''
+  nixpkgs.overlays = [
+    (self: super: {
+      ccacheWrapper = super.ccacheWrapper.override {
+        extraConfig = ''
         export CCACHE_COMPRESS=1
         export CCACHE_DIR="${config.programs.ccache.cacheDir}"
         export CCACHE_UMASK=007
@@ -23,8 +23,16 @@ nixpkgs.overlays = [
           exit 1
         fi
       '';
-    };
-  })
-];
-nix.settings.extra-sandbox-paths = [ config.programs.ccache.cacheDir ];
+      };
+    })
+  ];
+  nix.settings.extra-sandbox-paths = [ config.programs.ccache.cacheDir ];
+  nix.settings = {
+    substituters = [
+      "https://cuda-maintainers.cachix.org"
+    ];
+    trusted-public-keys = [
+      "cuda-maintainers.cachix.org-1:0dq3bujKpuEPMCX6U4WylrUDZ9JyUG0VpVZa7CNfq5E="
+    ];
+  };
 }