diff --git a/telethon/client/telegrambaseclient.py b/telethon/client/telegrambaseclient.py
index df754d9b..95c28532 100644
--- a/telethon/client/telegrambaseclient.py
+++ b/telethon/client/telegrambaseclient.py
@@ -313,6 +313,7 @@ class TelegramBaseClient(abc.ABC):
                 DEFAULT_IPV6_IP if self._use_ipv6 else DEFAULT_IPV4_IP,
                 DEFAULT_PORT
             )
+            session.save()
 
         self.flood_sleep_threshold = flood_sleep_threshold