diff --git a/streamtg.py b/streamtg.py
index 155744d..7079443 100644
--- a/streamtg.py
+++ b/streamtg.py
@@ -6,6 +6,7 @@ import yaml
 from aiohttp import web
 from telethon import TelegramClient
 from telethon.utils import _get_file_info
+from telethon.client.downloads import _GenericDownloadIter
 
 with open('config.yaml') as file:
     config = yaml.safe_load(file)
@@ -61,7 +62,13 @@ async def handler(request):
             if tmp_offset > size:
                 tmp_offset -= size
                 continue
-            async for chunk in client._iter_download(i, offset=tmp_offset, msg_data=(chat_id, i.id)):
+            stream = client._iter_download(i, offset=tmp_offset, request_size=131072, msg_data=(chat_id, i.id))
+            if isinstance(stream, _GenericDownloadIter):
+                __load_next_chunk = stream._load_next_chunk
+                def _load_next_chunk(mask=131071):
+                    return __load_next_chunk(mask=mask)
+                stream._load_next_chunk = _load_next_chunk
+            async for chunk in stream:
                 yield chunk[:tmp_length]
                 tmp_length -= len(chunk)
                 if tmp_length < 1: