diff --git a/crates/uv-build-backend/src/lib.rs b/crates/uv-build-backend/src/lib.rs
index c9dc4e6d2..1bdb68a67 100644
--- a/crates/uv-build-backend/src/lib.rs
+++ b/crates/uv-build-backend/src/lib.rs
@@ -662,7 +662,7 @@ mod tests {
         // Check that the source dist is reproducible across platforms.
         assert_snapshot!(
             format!("{:x}", sha2::Sha256::digest(fs_err::read(&source_dist_path).unwrap())),
-            @"871d1f859140721b67cbeaca074e7a2740c88c38028d0509eba87d1285f1da9e"
+            @"bb74bff575b135bb39e5c9bce56349441fb0923bb8857e32a5eaf34ec1843967"
         );
         // Check both the files we report and the actual files
         assert_snapshot!(format_file_list(build.source_dist_list_files, src.path()), @r"
diff --git a/crates/uv-build-backend/src/source_dist.rs b/crates/uv-build-backend/src/source_dist.rs
index 5a3e77b5d..2f0889fe7 100644
--- a/crates/uv-build-backend/src/source_dist.rs
+++ b/crates/uv-build-backend/src/source_dist.rs
@@ -299,6 +299,10 @@ impl TarGzWriter {
 impl DirectoryWriter for TarGzWriter {
     fn write_bytes(&mut self, path: &str, bytes: &[u8]) -> Result<(), Error> {
         let mut header = Header::new_gnu();
+        // Work around bug in Python's std tar module
+        // https://github.com/python/cpython/issues/141707
+        // https://github.com/astral-sh/uv/pull/17043#issuecomment-3636841022
+        header.set_entry_type(EntryType::Regular);
         header.set_size(bytes.len() as u64);
         // Reasonable default to avoid 0o000 permissions, the user's umask will be applied on
         // unpacking.
@@ -312,6 +316,10 @@ impl DirectoryWriter for TarGzWriter {
     fn write_file(&mut self, path: &str, file: &Path) -> Result<(), Error> {
         let metadata = fs_err::metadata(file)?;
         let mut header = Header::new_gnu();
+        // Work around bug in Python's std tar module
+        // https://github.com/python/cpython/issues/141707
+        // https://github.com/astral-sh/uv/pull/17043#issuecomment-3636841022
+        header.set_entry_type(EntryType::Regular);
         // Preserve the executable bit, especially for scripts
         #[cfg(unix)]
         let executable_bit = {