diff --git a/sync_url.py b/sync_url.py
index d2dce94..cb837a2 100755
--- a/sync_url.py
+++ b/sync_url.py
@@ -5,16 +5,27 @@ A simple script to download a course by name from ILIAS.
 """
 
 import argparse
-from pathlib import Path
+import os
+import re
+from pathlib import Path, PurePath
+from typing import Optional
 from urllib.parse import urlparse
 
 from PFERD import Pferd
 from PFERD.cookie_jar import CookieJar
 from PFERD.ilias import (IliasCrawler, IliasElementType,
                          KitShibbolethAuthenticator)
+from PFERD.transform import re_rename
 from PFERD.utils import to_path
 
 
+def sanitize_path(path: PurePath) -> Optional[PurePath]:
+    # Escape windows illegal path characters
+    if os.name == 'nt':
+        return PurePath(re.sub(r'[<>:"/\\|?]', "", str(path)))
+    return path
+
+
 def main() -> None:
     parser = argparse.ArgumentParser()
     parser.add_argument("--test-run", action="store_true")
@@ -59,7 +70,8 @@ def main() -> None:
         target=folder,
         full_url=args.url,
         cookies=args.cookies,
-        dir_filter=dir_filter
+        dir_filter=dir_filter,
+        transform=sanitize_path
     )