diff --git a/aiogram/bot/bot.py b/aiogram/bot/bot.py
index b30e5309..5933f0db 100644
--- a/aiogram/bot/bot.py
+++ b/aiogram/bot/bot.py
@@ -862,8 +862,8 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
     async def send_poll(self, chat_id: typing.Union[base.Integer, base.String],
                         question: base.String,
                         options: typing.List[base.String],
-                        disable_notification: typing.Optional[base.Boolean],
-                        reply_to_message_id: typing.Union[base.Integer, None],
+                        disable_notification: typing.Optional[base.Boolean] = None,
+                        reply_to_message_id: typing.Optional[base.Integer] = None,
                         reply_markup: typing.Union[types.InlineKeyboardMarkup,
                                                    types.ReplyKeyboardMarkup,
                                                    types.ReplyKeyboardRemove,