diff --git a/src/ytdl_sub/config/config_validator.py b/src/ytdl_sub/config/config_validator.py
index 8aa4f70b..55a91f55 100644
--- a/src/ytdl_sub/config/config_validator.py
+++ b/src/ytdl_sub/config/config_validator.py
@@ -1,4 +1,5 @@
 import os
+import posixpath
 from typing import Any
 from typing import Dict
 from typing import Optional
@@ -148,8 +149,8 @@ class ConfigOptions(StrictDictValidator):
         The directory to temporarily store downloaded files before moving them into their final
         directory. Defaults to .ytdl-sub-working-directory
         """
-        # Expands tildas to actual paths
-        return os.path.expanduser(self._working_directory.value)
+        # Expands tildas to actual paths, use native os sep
+        return os.path.expanduser(self._working_directory.value.replace(posixpath.sep, os.sep))
 
     @property
     def umask(self) -> Optional[str]: