diff --git a/yt_dlp/utils.py b/yt_dlp/utils.py
index 966548466..34a938362 100644
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@@ -5258,6 +5258,7 @@ class Config:
 
 class WebSocketsWrapper():
     """Wraps websockets module to use in non-async scopes"""
+    pool = None
 
     def __init__(self, url, headers=None, connect=True):
         self.loop = asyncio.events.new_event_loop()