diff --git a/pixelle_video/services/quality/character_analyzer.py b/pixelle_video/services/quality/character_analyzer.py
index 4cf607e..064234d 100644
--- a/pixelle_video/services/quality/character_analyzer.py
+++ b/pixelle_video/services/quality/character_analyzer.py
@@ -147,7 +147,6 @@ Output ONLY the JSON object, no additional text."""
             
             # Get VLM configuration
             # Priority: Environment variables > config.yaml > defaults
-            import os
             from pixelle_video.config import config_manager
             
             # Try to get VLM config from config.yaml