diff --git a/danmaku_xml_helper.py b/danmaku_xml_helper.py
index e74ef5e..fe83f8f 100644
--- a/danmaku_xml_helper.py
+++ b/danmaku_xml_helper.py
@@ -1,6 +1,7 @@
 import datetime
 import os
 import argparse
+from typing import Union
 
 from bs4 import BeautifulSoup
 
@@ -18,7 +19,7 @@ def check_file_exist(file):
         raise FileNotFoundError("文件不存在：%s" % file)
 
 
-def get_file_start(file: os.PathLike[str]) -> float:
+def get_file_start(file: Union[os.PathLike[str], str]) -> float:
     with open(file, "r", encoding="utf-8") as f:
         soup = BeautifulSoup("".join(f.readlines()), "lxml")
         danmaku_item = soup.find("d")
@@ -34,7 +35,7 @@ def get_file_start(file: os.PathLike[str]) -> float:
         return bias_ts_ms / 1000 - bias_sec
 
 
-def diff_danmaku_files(base_file: os.PathLike[str], file: os.PathLike[str]) -> float:
+def diff_danmaku_files(base_file: Union[os.PathLike[str], str], file: Union[os.PathLike[str], str]) -> float:
     return get_file_start(file) - get_file_start(base_file)