diff --git a/rust2rpm/crate.py b/rust2rpm/crate.py
index 305587b..bc7e4fb 100644
--- a/rust2rpm/crate.py
+++ b/rust2rpm/crate.py
@@ -155,12 +155,11 @@ def guess_local_project_version_from_path(project: str) -> tuple[str, str]:
 
 @contextlib.contextmanager
 def toml_temp_copy(toml_path: str):
-    with tempfile.TemporaryDirectory() as temp_dir:
-        temp_path = f"{temp_dir}/Cargo.toml"
-        with open(temp_path, "w") as file:
-            with open(toml_path) as orig:
-                file.write(orig.read())
-        yield temp_path
+    with open(toml_path, "rb") as toml_file:
+        orig = toml_file.read()
+    yield
+    with open(toml_path, "wb") as toml_file:
+        toml_file.write(orig)
 
 
 def process_project_local(
@@ -199,14 +198,14 @@ def process_project_local(
         version = package.version
         features = package.get_feature_names()
 
-        with toml_temp_copy(toml_path) as temp_toml:
-            diffs = make_patches(name, package.version, patch, patch_foreign, temp_toml, features)
+        with toml_temp_copy(toml_path):
+            diffs = make_patches(name, package.version, patch, patch_foreign, toml_path, features)
 
             # ensure metadata is up-to-date with changes from patches
-            metadata = Metadata.from_cargo(temp_toml)
+            metadata = Metadata.from_cargo(toml_path)
 
             if vendor:
-                vendor_tarball = generate_vendor_tarball(temp_toml, name, package.version)
+                vendor_tarball = generate_vendor_tarball(toml_path, name, package.version)
             else:
                 vendor_tarball = None