diff --git a/flake.nix b/flake.nix
index 5cc7e3c..d1bb3c8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -110,12 +110,7 @@
           buildPhase = ''
             export HOME=$TMPDIR
             mkdir -p .cargo
-            cat > .cargo/config.toml <<EOF
-            [source.crates-io]
-            replace-with = "vendored-sources"
-            [source.vendored-sources]
-            directory = "${vendoredDeps}"
-            EOF
+            cp ${vendoredDeps}/config.toml .cargo/config.toml
             cargo build --release --target wasm32-wasip1 --offline
           '';