diff --git a/tubesync/sync/youtube.py b/tubesync/sync/youtube.py
index c2c35464..e487fa3b 100644
--- a/tubesync/sync/youtube.py
+++ b/tubesync/sync/youtube.py
@@ -170,11 +170,11 @@ def get_media_info(url, /, *, days=None, info_json=None):
         })
     default_postprocessors = user_set('postprocessors', default_opts.__dict__, list())
     postprocessors = user_set('postprocessors', opts, default_postprocessors)
-    postprocessors.extend((dict(
+    postprocessors.append(dict(
         key='Exec',
         when='playlist',
         exec_cmd="/usr/bin/env bash /app/full_playlist.sh '%(id)s' '%(playlist_count)d'",
-    ),))
+    ))
     cache_directory_path = Path(user_set('cachedir', opts, '/dev/shm'))
     playlist_infojson = 'postprocessor_[%(id)s]_%(n_entries)d_%(playlist_count)d_temp'
     outtmpl = dict(