diff --git a/sys/compat/linux/linux_ioctl.h b/sys/compat/linux/linux_ioctl.h
--- a/sys/compat/linux/linux_ioctl.h
+++ b/sys/compat/linux/linux_ioctl.h
@@ -462,6 +462,7 @@
 #define	LINUX_IXOFF		0x0001000
 
 #define	LINUX_IMAXBEL		0x0002000
+#define	LINUX_IUTF8		0x0004000
 
 /* Linux c_oflag masks */
 #define	LINUX_OPOST		0x0000001
diff --git a/sys/compat/linux/linux_ioctl.c b/sys/compat/linux/linux_ioctl.c
--- a/sys/compat/linux/linux_ioctl.c
+++ b/sys/compat/linux/linux_ioctl.c
@@ -416,6 +416,8 @@
 		lios->c_iflag |= LINUX_IXOFF;
 	if (bios->c_iflag & IMAXBEL)
 		lios->c_iflag |= LINUX_IMAXBEL;
+	if (bios->c_iflag & IUTF8)
+		lios->c_iflag |= LINUX_IUTF8;
 
 	lios->c_oflag = 0;
 	if (bios->c_oflag & OPOST)
@@ -533,6 +535,8 @@
 		bios->c_iflag |= IXOFF;
 	if (lios->c_iflag & LINUX_IMAXBEL)
 		bios->c_iflag |= IMAXBEL;
+	if (lios->c_iflag & LINUX_IUTF8)
+		bios->c_iflag |= IUTF8;
 
 	bios->c_oflag = 0;
 	if (lios->c_oflag & LINUX_OPOST)