diff --git a/man2/ioctl_tty.2 b/man2/ioctl_tty.2
index 46294e63f..de6d1c839 100644
--- a/man2/ioctl_tty.2
+++ b/man2/ioctl_tty.2
@@ -701,7 +701,8 @@ Insufficient permission.
 Check the condition of DTR on the serial port.
 .PP
 .EX
-#include <termios.h>
+#include <stdio.h>
+#include <unistd.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>