diff --git a/src/pkgs/files/default.nix b/src/pkgs/files/default.nix
index 3149e1f..b09c06f 100644
--- a/src/pkgs/files/default.nix
+++ b/src/pkgs/files/default.nix
@@ -24,6 +24,8 @@ in
 
   nixConf = writeText "nix.conf" ''
     sandbox = false
+    substituters = https://cache.nixos.org https://nix-on-droid.cachix.org
+    trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= nix-on-droid.cachix.org-1:56snoMJTXmDRC1Ei24CmKoUqvHJ9XCp+nidK7qkMQrU=
   '';
 
   nixOnDroidInstall = callPackage ./nix-on-droid-install.nix { };