diff --git a/bfxapi/websocket/handlers.py b/bfxapi/websocket/handlers.py
index f2fd7ea..c56046a 100644
--- a/bfxapi/websocket/handlers.py
+++ b/bfxapi/websocket/handlers.py
@@ -30,7 +30,7 @@ class PublicChannelsHandler(object):
         _clear = lambda dictionary, *args: { key: value for key, value in dictionary.items() if key not in args }
 
         if channel := subscription["channel"] or channel in self.__handlers.keys():
-            return self.__handlers[channel](_clear(subscription, "event", "channel"), *stream)
+            return self.__handlers[channel](_clear(subscription, "event", "channel", "subId"), *stream)
 
     def __ticker_channel_handler(self, subscription, *stream):
         if subscription["symbol"].startswith("t"):
diff --git a/bfxapi/websocket/subscriptions.py b/bfxapi/websocket/subscriptions.py
index 2acc1af..e22bb5e 100644
--- a/bfxapi/websocket/subscriptions.py
+++ b/bfxapi/websocket/subscriptions.py
@@ -24,7 +24,6 @@ class Book(TypedDict):
     prec: str
     freq: str
     len: str
-    subId: int
     pair: str
 
 class Candles(TypedDict):