diff --git a/librarian_server/stores/local.py b/librarian_server/stores/local.py
index 776516b..63ca237 100644
--- a/librarian_server/stores/local.py
+++ b/librarian_server/stores/local.py
@@ -79,8 +79,10 @@ def stage(self, file_size: int, file_name: Path) -> tuple[Path]:
 
         # Create the empty directory.
         resolved_path = self._resolved_path_staging(stage_path)
+
         if self.group_write_after_stage:
             resolved_path.mkdir(mode=0o775)
+            os.chmod(resolved_path, 0o775)
         else:
             resolved_path.mkdir()