diff --git a/proxy/vless/outbound/outbound.go b/proxy/vless/outbound/outbound.go
index d34b1904..041cc605 100644
--- a/proxy/vless/outbound/outbound.go
+++ b/proxy/vless/outbound/outbound.go
@@ -223,6 +223,8 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 			r, _ := t.FieldByName("rawInput")
 			input = (*bytes.Reader)(unsafe.Pointer(p + i.Offset))
 			rawInput = (*bytes.Buffer)(unsafe.Pointer(p + r.Offset))
+		default:
+			panic("unknown VLESS request command")
 		}
 	default:
 		ob.CanSpliceCopy = 3