diff --git a/telethon/client/auth.py b/telethon/client/auth.py
index 36afc343..b6add62c 100644
--- a/telethon/client/auth.py
+++ b/telethon/client/auth.py
@@ -550,7 +550,8 @@ class AuthMethods(MessageParseMethods, UserMethods):
         return await self.start()
 
     def __exit__(self, *args):
-        self.disconnect()  # It's also syncified, like start()
+        # No loop.run_until_complete; it's already syncified
+        self.disconnect()
 
     async def __aexit__(self, *args):
         await self.disconnect()
diff --git a/telethon/client/updates.py b/telethon/client/updates.py
index 6b85de7a..2c409735 100644
--- a/telethon/client/updates.py
+++ b/telethon/client/updates.py
@@ -37,7 +37,8 @@ class UpdateMethods(UserMethods):
         except KeyboardInterrupt:
             pass
         finally:
-            self.loop.run_until_complete(self.disconnect())
+            # No loop.run_until_complete; it's already syncified
+            self.disconnect()
 
     def on(self, event):
         """