diff --git a/libp2p/stream_muxer/mplex/mplex_stream.py b/libp2p/stream_muxer/mplex/mplex_stream.py
index 7b8c1e5..ce1b1e0 100644
--- a/libp2p/stream_muxer/mplex/mplex_stream.py
+++ b/libp2p/stream_muxer/mplex/mplex_stream.py
@@ -1,5 +1,4 @@
 import asyncio
-from io import BytesIO
 
 from libp2p.stream_muxer.abc import IMuxedConn, IMuxedStream