diff --git a/client/src/telethon/_impl/client/client/client.py b/client/src/telethon/_impl/client/client/client.py
index d54803b0..dbe29369 100644
--- a/client/src/telethon/_impl/client/client/client.py
+++ b/client/src/telethon/_impl/client/client/client.py
@@ -214,7 +214,7 @@ class Client:
         datacenter: Optional[DataCenter] = None,
         connector: Optional[Connector] = None,
     ) -> None:
-        assert isinstance(__package__, str)
+        assert __package__
         base_logger = logger or logging.getLogger(__package__[: __package__.index(".")])
 
         self._sender: Optional[Sender] = None