diff --git a/src/you_get/downloader/acfun.py b/src/you_get/downloader/acfun.py
index 79eb1b4c..aa880bee 100644
--- a/src/you_get/downloader/acfun.py
+++ b/src/you_get/downloader/acfun.py
@@ -33,7 +33,7 @@ def acfun_download_by_id(id, title = None, output_dir = '.', merge = True, info_
     if not info_only:
         print('Downloading %s ...' % (title + '.cmt.json'))
         cmt = get_srt_json(vid)
-        with open(title + '.cmt.json', 'w') as x:
+        with open(os.path.join(output_dir, title + '.cmt.json'), 'w') as x:
             x.write(cmt)
 
 def acfun_download(url, output_dir = '.', merge = True, info_only = False):
diff --git a/src/you_get/downloader/bilibili.py b/src/you_get/downloader/bilibili.py
index 832cd0c4..20e3c467 100644
--- a/src/you_get/downloader/bilibili.py
+++ b/src/you_get/downloader/bilibili.py
@@ -101,7 +101,7 @@ def bilibili_download(url, output_dir = '.', merge = True, info_only = False):
     if not info_only:
         print('Downloading %s ...' % (title + '.cmt.xml'))
         xml = get_srt_xml(id)
-        with open(title + '.cmt.xml', 'w') as x:
+        with open(os.path.join(output_dir, title + '.cmt.xml'), 'w') as x:
             x.write(xml)
 
 site_info = "bilibili.tv"