diff --git a/pyrogram/methods/messages/send_audio.py b/pyrogram/methods/messages/send_audio.py
index d4a3001b0..5f85eb797 100644
--- a/pyrogram/methods/messages/send_audio.py
+++ b/pyrogram/methods/messages/send_audio.py
@@ -222,7 +222,7 @@ async def progress(current, total):
                 else:
                     media = utils.get_input_media_from_file_id(audio, FileType.AUDIO)
             else:
-                mime_type = self.guess_mime_type(audio.name) or "audio/mpeg"
+                mime_type = self.guess_mime_type(file_name or audio.name) or "audio/mpeg"
                 if mime_type == "audio/ogg":
                     mime_type = "audio/opus"
                 thumb = await self.save_file(thumb)