diff --git a/flake.nix b/flake.nix
index ea2459e..5be9bfb 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,7 +13,7 @@
       in
       {
         packages.default = naersk-lib.buildPackage {
-          src = ./.;
+          src = pkgs.lib.sourceFilesBySuffices ./. [ ".rs" ".toml" ".lock" ];
           nativeBuildInputs = with pkgs; [ installShellFiles ];
           meta.mainProgram = "timers";
           postInstall = ''