diff --git a/sungrow.go b/sungrow.go
index b4cef28..6b004be 100644
--- a/sungrow.go
+++ b/sungrow.go
@@ -56,8 +56,7 @@ func (c *sungrowConn) Write(msg []byte) (int, error) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 	c.txid = binary.BigEndian.Uint16(msg[:2])
-
-	//c.fifo.Truncate(0)
+	c.fifo.Truncate(0)
 
 	bs := c.block.BlockSize()
 	padlen := bs - (len(msg) % bs)