diff --git a/ultravox/training/config_base.py b/ultravox/training/config_base.py
index baafc933..c22d2b8d 100644
--- a/ultravox/training/config_base.py
+++ b/ultravox/training/config_base.py
@@ -121,7 +121,7 @@ def __post_init__(self):
             self.output_dir = Path("runs") / self.exp_name
 
         # HF Pipeline gets tripped up if the path has a "." in it
-        self.output_dir = self.output_dir.replace(".", "--")
+        self.output_dir = Path(str(self.output_dir).replace(".", "--"))
 
         if self.logs_dir is None:
             self.logs_dir = self.output_dir / "logs"