diff --git a/adb_shell/adb_device.py b/adb_shell/adb_device.py
index 8a23dd9..c295028 100644
--- a/adb_shell/adb_device.py
+++ b/adb_shell/adb_device.py
@@ -1590,7 +1590,7 @@ def _filesync_send(self, command_id, adb_info, filesync_info, data=b"", size=Non
             self._filesync_flush(adb_info, filesync_info)
 
         buf = struct.pack(b"<2I", constants.FILESYNC_ID_TO_WIRE[command_id], size) + data
-        filesync_info.send_buffer[filesync_info.send_idx : filesync_info.send_idx + len(buf)] = buf
+        filesync_info.send_buffer[filesync_info.send_idx : filesync_info.send_idx + len(buf)] = buf  # noqa
         filesync_info.send_idx += len(buf)
 
 
diff --git a/adb_shell/adb_device_async.py b/adb_shell/adb_device_async.py
index 9f55e60..c44987b 100644
--- a/adb_shell/adb_device_async.py
+++ b/adb_shell/adb_device_async.py
@@ -1650,7 +1650,7 @@ async def _filesync_send(self, command_id, adb_info, filesync_info, data=b"", si
             await self._filesync_flush(adb_info, filesync_info)
 
         buf = struct.pack(b"<2I", constants.FILESYNC_ID_TO_WIRE[command_id], size) + data
-        filesync_info.send_buffer[filesync_info.send_idx : filesync_info.send_idx + len(buf)] = buf
+        filesync_info.send_buffer[filesync_info.send_idx : filesync_info.send_idx + len(buf)] = buf  # noqa
         filesync_info.send_idx += len(buf)