diff --git a/ttynvt.c b/ttynvt.c
index cb94155..224290e 100644
--- a/ttynvt.c
+++ b/ttynvt.c
@@ -670,6 +670,9 @@ static const char *_ioctl_name(int cmd)
         CASE(TCSBRK);
         CASE(TIOCGWINSZ);
         CASE(TIOCSWINSZ);
+        /* Controlling terminal */
+        CASE(TIOCSCTTY);
+        CASE(TIOCNOTTY);
         /* Exclusive mode */
         CASE(TIOCEXCL);
         CASE(TIOCGEXCL);