diff --git a/vnpy_ctabacktester/engine.py b/vnpy_ctabacktester/engine.py
index f71794e..f225b68 100644
--- a/vnpy_ctabacktester/engine.py
+++ b/vnpy_ctabacktester/engine.py
@@ -93,7 +93,7 @@ def load_strategy_class_from_folder(self, path: Path, module_name: str = ""):
         Load strategy class from certain folder.
         """
         for suffix in ["py", "pyd", "so"]:
-            pathname: str = os.path.join(str(path), f"*.{suffix}")
+            pathname: str = str(path.joinpath(f"*.{suffix}"))
             for filepath in glob(pathname):
                 filename: str = Path(filepath).stem
                 name: str = f"{module_name}.{filename}"