diff --git a/telethon/client/telegrambaseclient.py b/telethon/client/telegrambaseclient.py
index 162e9dcd..62faecae 100644
--- a/telethon/client/telegrambaseclient.py
+++ b/telethon/client/telegrambaseclient.py
@@ -18,7 +18,7 @@ from ..tl.alltlobjects import LAYER
 
 DEFAULT_DC_ID = 2
 DEFAULT_IPV4_IP = '149.154.167.51'
-DEFAULT_IPV6_IP = '[2001:67c:4e8:f002::a]'
+DEFAULT_IPV6_IP = '2001:67c:4e8:f002::a'
 DEFAULT_PORT = 443
 
 if typing.TYPE_CHECKING: