diff --git a/tools/start-stop-daemon.c b/tools/start-stop-daemon.c
index cc0315c130..8daeda7402 100644
--- a/tools/start-stop-daemon.c
+++ b/tools/start-stop-daemon.c
@@ -1030,7 +1030,9 @@ int main(int argc, char **argv)
 		/* change tty */
 		fd = open("/dev/tty", O_RDWR);
 		if (fd >= 0) {
-			ioctl(fd, TIOCNOTTY, 0);
+			if (ioctl(fd, TIOCNOTTY, 0) < 0)
+				printf("ioctl TIOCNOTTY failed: %s\n",
+				       strerror(errno));
 			close(fd);
 		}
 		chdir("/");