diff --git a/app/helper/directory.py b/app/helper/directory.py
index e348d06a..e1d52c9d 100644
--- a/app/helper/directory.py
+++ b/app/helper/directory.py
@@ -1,3 +1,4 @@
+import os
 from pathlib import Path
 from typing import List, Optional
 
@@ -128,7 +129,7 @@ class DirectoryHelper:
             for matched_dir in matched_dirs:
                 try:
                     # 计算in_path和path的公共字符串长度
-                    relative_len = len(StringUtils.find_common_prefix(str(in_path), matched_dir.path))
+                    relative_len = len(StringUtils.find_common_prefix(str(in_path), str(Path(matched_dir.path))))
                     if len(str(matched_dir.path)) == relative_len \
                             and relative_len >= max_length:
                         # 目录完整匹配且是最长的，直接返回