diff --git a/proxy/vmess/inbound/inbound.go b/proxy/vmess/inbound/inbound.go
index 9954dcdbf..43e46f898 100644
--- a/proxy/vmess/inbound/inbound.go
+++ b/proxy/vmess/inbound/inbound.go
@@ -221,7 +221,7 @@ func (this *VMessInboundHandler) HandleConnection(connection internet.Connection
 type Factory struct{}
 
 func (this *Factory) StreamCapability() internet.StreamConnectionType {
-	return internet.StreamConnectionTypeRawTCP | internet.StreamConnectionTypeTCP
+	return internet.StreamConnectionTypeRawTCP | internet.StreamConnectionTypeTCP | internet.StreamConnectionTypeKCP
 }
 
 func (this *Factory) Create(space app.Space, rawConfig interface{}, meta *proxy.InboundHandlerMeta) (proxy.InboundHandler, error) {
diff --git a/proxy/vmess/outbound/outbound.go b/proxy/vmess/outbound/outbound.go
index b484da23f..a0c21eb31 100644
--- a/proxy/vmess/outbound/outbound.go
+++ b/proxy/vmess/outbound/outbound.go
@@ -157,7 +157,7 @@ func (this *VMessOutboundHandler) handleResponse(session *raw.ClientSession, con
 type Factory struct{}
 
 func (this *Factory) StreamCapability() internet.StreamConnectionType {
-	return internet.StreamConnectionTypeRawTCP | internet.StreamConnectionTypeTCP
+	return internet.StreamConnectionTypeRawTCP | internet.StreamConnectionTypeTCP | internet.StreamConnectionTypeKCP
 }
 
 func (this *Factory) Create(space app.Space, rawConfig interface{}, meta *proxy.OutboundHandlerMeta) (proxy.OutboundHandler, error) {