diff --git a/app.py b/app.py
index 0aacf00..a2b3597 100644
--- a/app.py
+++ b/app.py
@@ -290,7 +290,7 @@ def proxy(video_id):
     video_width, video_height = get_video_resolution(params) if params else (None, None)
 
     download_allowed = allow_download(params) if params else False
-    request_user_agent = request.headers.get('User-Agent', '')
+    request_user_agent = request.headers.get('User-Agent', '').lower()
     if download_allowed and 'discordbot' not in request_user_agent:
         logger.info(f"Download ignored for video ID {video_id} due to user agent ({request_user_agent})")
         download_allowed = False