diff --git a/aiogram/types/inline_keyboard.py b/aiogram/types/inline_keyboard.py
index d0380fdb..fd8f0e75 100644
--- a/aiogram/types/inline_keyboard.py
+++ b/aiogram/types/inline_keyboard.py
@@ -63,7 +63,7 @@ class InlineKeyboardMarkup(base.TelegramObject):
         :return: self
         :rtype: :obj:`types.InlineKeyboardMarkup`
         """
-        self.inline_keyboard.append(buttons or [])
+        self.inline_keyboard.append(list(buttons) or [])
         return self
 
     def insert(self, button):