diff --git a/fast_bert/learner_util.py b/fast_bert/learner_util.py
index 4e0b241..715377a 100644
--- a/fast_bert/learner_util.py
+++ b/fast_bert/learner_util.py
@@ -128,6 +128,8 @@ def save_model(self, path=None):
 
         if not path:
             path = self.output_dir / "model_out"
+        else:
+            path = Path(path)
 
         path.mkdir(exist_ok=True)