diff --git a/transport/internet/kcp/io.go b/transport/internet/kcp/io.go
index c39b2d6d4..8548b7e2e 100644
--- a/transport/internet/kcp/io.go
+++ b/transport/internet/kcp/io.go
@@ -51,7 +51,7 @@ type KCPPacketWriter struct {
 	Security cipher.AEAD
 	Writer   io.Writer
 
-	buffer [32 * 1024]byte
+	buffer [2048]byte
 }
 
 func (w *KCPPacketWriter) Overhead() int {