diff --git a/packets.go b/packets.go
index 290a3887a..02ac16067 100644
--- a/packets.go
+++ b/packets.go
@@ -214,6 +214,7 @@ func (mc *mysqlConn) writeAuthPacket(cipher []byte) error {
 		clientLongPassword |
 		clientTransactions |
 		clientLocalFiles |
+		clientPluginAuth |
 		mc.flags&clientLongFlag
 
 	if mc.cfg.clientFoundRows {