diff --git a/src/util.py b/src/util.py
index 7a0fdf4..f06bc9c 100644
--- a/src/util.py
+++ b/src/util.py
@@ -27,7 +27,7 @@ def project_root(dir_path: tuple[str] = tuple(), file: str = None):
 
 def working_path(dir_path: tuple[str] = tuple(), file: str = None):
     """Returns file path relative to the working ephemeral directory."""
-    dir_path = project_root("run", *dir_path)
+    dir_path = project_root(("run", *dir_path))
     Path(dir_path).mkdir(parents=True, exist_ok=True)
 
     if file is not None: