diff --git a/pyrogram/client/methods/messages/send_sticker.py b/pyrogram/client/methods/messages/send_sticker.py
index 8cccfe01..60b8609e 100644
--- a/pyrogram/client/methods/messages/send_sticker.py
+++ b/pyrogram/client/methods/messages/send_sticker.py
@@ -134,7 +134,7 @@ class SendSticker(BaseClient):
             elif hasattr(sticker, "read"):
                 file = self.save_file(sticker, progress=progress, progress_args=progress_args)
                 media = types.InputMediaUploadedDocument(
-                    mime_type=self.guess_mime_type(sticker) or "image/webp",
+                    mime_type=self.guess_mime_type(sticker.name) or "image/webp",
                     file=file,
                     attributes=[
                         types.DocumentAttributeFilename(file_name=sticker.name)