diff --git a/discord/state.py b/discord/state.py
index 35fe9712a..b6f407d8d 100644
--- a/discord/state.py
+++ b/discord/state.py
@@ -1259,7 +1259,7 @@ class ConnectionState:
             user_id = utils._get_as_snowflake(data, 'user_id')
             if isinstance(channel, DMChannel):
                 member = channel.recipient
-            elif isinstance(channel, TextChannel) and guild is not None:
+            elif isinstance(channel, (Thread, TextChannel)) and guild is not None:
                 member = guild.get_member(user_id)
                 if member is None:
                     member_data = data.get('member')