diff --git a/flake.nix b/flake.nix
index a2d99c2..ff42b87 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,6 +11,7 @@
         (import sources.flake-compat {
           src = sources.nixpkgs;
           copySourceTreeToStore = false;
+          useBuiltinsFetchTree = true;
         }).outputs;
       inherit (nixpkgs) lib;
       pkgsFor = nixpkgs.legacyPackages;