diff --git a/telethon/client/messages.py b/telethon/client/messages.py
index 009051b8..2bff203e 100644
--- a/telethon/client/messages.py
+++ b/telethon/client/messages.py
@@ -618,7 +618,7 @@ class MessageMethods:
             thumb: 'hints.FileLike' = None,
             force_document: bool = False,
             clear_draft: bool = False,
-            buttons: 'hints.MarkupLike' = None,
+            buttons: typing.Optional['hints.MarkupLike'] = None,
             silent: bool = None,
             background: bool = None,
             supports_streaming: bool = False,
@@ -1030,7 +1030,7 @@ class MessageMethods:
             file: 'hints.FileLike' = None,
             thumb: 'hints.FileLike' = None,
             force_document: bool = False,
-            buttons: 'hints.MarkupLike' = None,
+            buttons: typing.Optional['hints.MarkupLike'] = None,
             supports_streaming: bool = False,
             schedule: 'hints.DateLike' = None
     ) -> 'types.Message':
diff --git a/telethon/client/uploads.py b/telethon/client/uploads.py
index 4c9f9d32..a0df1b59 100644
--- a/telethon/client/uploads.py
+++ b/telethon/client/uploads.py
@@ -110,7 +110,7 @@ class UploadMethods:
             formatting_entities: typing.Optional[typing.List[types.TypeMessageEntity]] = None,
             voice_note: bool = False,
             video_note: bool = False,
-            buttons: 'hints.MarkupLike' = None,
+            buttons: typing.Optional['hints.MarkupLike'] = None,
             silent: bool = None,
             background: bool = None,
             supports_streaming: bool = False,