diff --git a/flake.nix b/flake.nix
index fe5d008..5cb0636 100644
--- a/flake.nix
+++ b/flake.nix
@@ -141,6 +141,8 @@
         });
         sausage = craneLib.buildPackage (common // {
           inherit cargoArtifacts;
+          # Deno loads extension TypeScript from the vendored sources at runtime.
+          doNotRemoveReferencesToVendorDir = true;
           cargoExtraArgs = "--locked -p sausage";
           doCheck = false;
           nativeBuildInputs = common.nativeBuildInputs ++ [ pkgs.makeWrapper ];