diff --git a/ssh/session.go b/ssh/session.go
index d3321f6..eca31a2 100644
--- a/ssh/session.go
+++ b/ssh/session.go
@@ -85,6 +85,7 @@ const (
 	IXANY         = 39
 	IXOFF         = 40
 	IMAXBEL       = 41
+	IUTF8         = 42 // RFC 8160
 	ISIG          = 50
 	ICANON        = 51
 	XCASE         = 52