diff --git a/src/lean_spec/node/networking/transport/quic/stream_adapter.py b/src/lean_spec/node/networking/transport/quic/stream_adapter.py
index e2f1a002d..712621b2c 100644
--- a/src/lean_spec/node/networking/transport/quic/stream_adapter.py
+++ b/src/lean_spec/node/networking/transport/quic/stream_adapter.py
@@ -145,9 +145,7 @@ async def finish_write(self) -> None:
 
         Flushes any buffered data before sending FIN.
         """
-        if self._write_buffer:
-            await self._stream.write(self._write_buffer)
-            self._write_buffer = b""
+        await self.drain()
         await self._stream.finish_write()
 
     async def negotiate_server(