diff --git a/src/llmtuner/extras/ploting.py b/src/llmtuner/extras/ploting.py
index aa101cb7..fd3cb8a3 100644
--- a/src/llmtuner/extras/ploting.py
+++ b/src/llmtuner/extras/ploting.py
@@ -52,6 +52,6 @@ def plot_loss(save_dictionary: os.PathLike, keys: List[str] = ["loss"]) -> None:
         plt.xlabel("step")
         plt.ylabel(key)
         plt.legend()
-        figure_path = os.path.join(save_dictionary, "training_{}.png".format(key.replace(os.path.sep, "_")))
+        figure_path = os.path.join(save_dictionary, "training_{}.png".format(key.replace("/", "_")))
         plt.savefig(figure_path, format="png", dpi=100)
         print("Figure saved at:", figure_path)