diff --git a/bin/stty/stty.1 b/bin/stty/stty.1
--- a/bin/stty/stty.1
+++ b/bin/stty/stty.1
@@ -32,7 +32,7 @@
 .\"     @(#)stty.1	8.4 (Berkeley) 4/18/94
 .\" $FreeBSD$
 .\"
-.Dd May 24, 2022
+.Dd September 27, 2022
 .Dt STTY 1
 .Os
 .Sh NAME
@@ -40,7 +40,7 @@
 .Nd set the options for a terminal device interface
 .Sh SYNOPSIS
 .Nm
-.Op Fl a | e | g
+.Op Fl a | e | g | i
 .Op Fl f Ar file
 .Op Ar arguments
 .Sh DESCRIPTION
@@ -85,6 +85,23 @@
 .Nm
 to restore the current terminal state as per
 .St -p1003.2 .
+.It Fl i
+Allow
+.Nm
+to change terminal settings even when executing in background
+process group (see description of the job control in
+.Xr termios 4 ) .
+.Pp
+Normally, such attempt results in kernel sending the
+.Va SIGTTOU
+signal and stopping the process until its group is returned
+to foreground.
+Using this option makes
+.Nm
+ignore
+.Va SIGTTOU .
+Note that changing terminal settings for running foreground
+job that is not prepared for it might cause inconsistencies.
 .El
 .Pp
 The following arguments are available to set the terminal
@@ -607,9 +624,10 @@
 .St -p1003.2
 compatible.
 The flags
-.Fl e
-and
+.Fl e ,
 .Fl f
+and
+.Fl i
 are
 extensions to the standard.
 .Sh HISTORY
diff --git a/bin/stty/stty.c b/bin/stty/stty.c
--- a/bin/stty/stty.c
+++ b/bin/stty/stty.c
@@ -47,6 +47,7 @@
 #include <err.h>
 #include <fcntl.h>
 #include <limits.h>
+#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -59,6 +60,7 @@
 main(int argc, char *argv[])
 {
 	struct info i;
+	struct sigaction sa;
 	enum FMT fmt;
 	int ch;
 	const char *file, *errstr = NULL;
@@ -69,8 +71,8 @@
 
 	opterr = 0;
 	while (optind < argc &&
-	    strspn(argv[optind], "-aefg") == strlen(argv[optind]) &&
-	    (ch = getopt(argc, argv, "aef:g")) != -1)
+	    strspn(argv[optind], "-aefgi") == strlen(argv[optind]) &&
+	    (ch = getopt(argc, argv, "aef:gi")) != -1)
 		switch(ch) {
 		case 'a':		/* undocumented: POSIX compatibility */
 			fmt = POSIX;
@@ -86,6 +88,12 @@
 		case 'g':
 			fmt = GFLAG;
 			break;
+		case 'i':
+			memset(&sa, 0, sizeof(sa));
+			sa.sa_handler = SIG_IGN;
+			if (sigaction(SIGTTOU, &sa, NULL) == -1)
+				err(1, "sigaction");
+			break;
 		case '?':
 		default:
 			goto args;
@@ -161,6 +169,6 @@
 {
 
 	(void)fprintf(stderr,
-	    "usage: stty [-a | -e | -g] [-f file] [arguments]\n");
+	    "usage: stty [-a | -e | -g] [-i] [-f file] [arguments]\n");
 	exit (1);
 }