diff --git a/infra/conf/transport_internet.go b/infra/conf/transport_internet.go
index b4458096b458..14c97007a241 100644
--- a/infra/conf/transport_internet.go
+++ b/infra/conf/transport_internet.go
@@ -72,7 +72,7 @@ func (c *KCPConfig) Build() (proto.Message, error) {
 	}
 	if c.Tti != nil {
 		tti := *c.Tti
-		if tti < 10 || tti > 100 {
+		if tti < 10 || tti > 5000 {
 			return nil, errors.New("invalid mKCP TTI: ", tti).AtError()
 		}
 		config.Tti = &kcp.TTI{Value: tti}