diff --git a/sys/sys/ttydefaults.h b/sys/sys/ttydefaults.h
index 7e64babbc7f1..6f33973842ce 100644
--- a/sys/sys/ttydefaults.h
+++ b/sys/sys/ttydefaults.h
@@ -45,7 +45,7 @@
 /*
  * Defaults on "first" open.
  */
-#define	TTYDEF_IFLAG	(BRKINT	| ICRNL	| IMAXBEL | IXON | IXANY)
+#define	TTYDEF_IFLAG	(BRKINT	| ICRNL	| IMAXBEL | IXON | IXANY | IUTF8)
 #define	TTYDEF_OFLAG	(OPOST | ONLCR)
 #define	TTYDEF_LFLAG_NOECHO (ICANON | ISIG | IEXTEN)
 #define	TTYDEF_LFLAG_ECHO (TTYDEF_LFLAG_NOECHO \