diff --git a/bin/stty/modes.c b/bin/stty/modes.c
--- a/bin/stty/modes.c
+++ b/bin/stty/modes.c
@@ -126,6 +126,8 @@
 	{ "-decctlq",	IXANY, 0 },
 	{ "imaxbel",	IMAXBEL, 0 },
 	{ "-imaxbel",	0, IMAXBEL },
+	{ "iutf8",	IUTF8, 0 },
+	{ "-iutf8",	0, IUTF8 },
 	{ NULL,		0, 0 },
 };
 
diff --git a/bin/stty/print.c b/bin/stty/print.c
--- a/bin/stty/print.c
+++ b/bin/stty/print.c
@@ -127,6 +127,7 @@
 	put("-inpck", INPCK, 0);
 	put("-ignpar", IGNPAR, 0);
 	put("-parmrk", PARMRK, 0);
+	put("-iutf8", IUTF8, 1);
 
 	/* output flags */
 	tmp = tp->c_oflag;
diff --git a/bin/stty/stty.1 b/bin/stty/stty.1
--- a/bin/stty/stty.1
+++ b/bin/stty/stty.1
@@ -224,6 +224,9 @@
 .Cm imaxbel
 is unset and the input queue is full, the next input character causes
 the entire input and output queues to be discarded.
+.It Cm iutf8 Pq Fl iutf8
+Assume that input characters are UTF-8 encoded. Setting this flag
+causes backspace to properly delete multibyte characters in canonical mode.
 .El
 .Ss Output Modes:
 This corresponds to the c_oflag of the termios structure.
diff --git a/share/man/man4/termios.4 b/share/man/man4/termios.4
--- a/share/man/man4/termios.4
+++ b/share/man/man4/termios.4
@@ -884,6 +884,8 @@
 /* any char will restart after stop */
 .It Dv IMAXBEL
 /* ring bell on input queue full */
+.It Dv IUTF8
+/* assume input is UTF-8 encoded */
 .El
 .Pp
 In the context of asynchronous serial data transmission, a break
diff --git a/sys/kern/tty.c b/sys/kern/tty.c
--- a/sys/kern/tty.c
+++ b/sys/kern/tty.c
@@ -85,8 +85,8 @@
 /*
  * Flags that are supported and stored by this implementation.
  */
-#define TTYSUP_IFLAG	(IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|\
-			INLCR|IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL)
+#define TTYSUP_IFLAG	(IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|ISTRIP|INLCR|\
+			IGNCR|ICRNL|IXON|IXOFF|IXANY|IMAXBEL|IUTF8)
 #define TTYSUP_OFLAG	(OPOST|ONLCR|TAB3|ONOEOT|OCRNL|ONOCR|ONLRET)
 #define TTYSUP_LFLAG	(ECHOKE|ECHOE|ECHOK|ECHO|ECHONL|ECHOPRT|\
 			ECHOCTL|ISIG|ICANON|ALTWERASE|IEXTEN|TOSTOP|\
diff --git a/sys/sys/_termios.h b/sys/sys/_termios.h
--- a/sys/sys/_termios.h
+++ b/sys/sys/_termios.h
@@ -97,6 +97,7 @@
 #endif
 #if __BSD_VISIBLE
 #define	IMAXBEL		0x00002000	/* ring bell on input queue full */
+#define IUTF8		0x00004000	/* assume input is utf-8 encoded */
 #endif
 
 /*