diff --git a/apps/worker/video_processing/thumbnail_generator.py b/apps/worker/video_processing/thumbnail_generator.py
index 6ce0225ea..ad6e2fd6f 100755
--- a/apps/worker/video_processing/thumbnail_generator.py
+++ b/apps/worker/video_processing/thumbnail_generator.py
@@ -187,8 +187,8 @@ def extract_and_upload_cover_frames(
     Returns:
         封面候选列表，每项包含 {"url": str, "position": float}
     """
-    from video_processing.oss_helpers import upload_to_oss
     from video_processing.ffmpeg_utils import probe_duration
+    from video_processing.oss_helpers import upload_to_oss
 
     try:
         duration = probe_duration(video_path)