diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c8cbf08b6dcfd2cf235e5692833d2d4e56b81d30..7cf57e6cadbf8e621c76906be7cf5eb6747fedca 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1196,8 +1196,6 @@ int tty_send_xchar(struct tty_struct *tty, char ch)
 	return 0;
 }
 
-static char ptychar[] = "pqrstuvwxyzabcde";
-
 /**
  *	pty_line_name	-	generate name for a pty
  *	@driver: the tty driver in use
@@ -1211,6 +1209,7 @@ static char ptychar[] = "pqrstuvwxyzabcde";
  */
 static void pty_line_name(struct tty_driver *driver, int index, char *p)
 {
+	static const char ptychar[] = "pqrstuvwxyzabcde";
 	int i = index + driver->name_base;
 	/* ->name is initialized to "ttyp", but "tty" is expected */
 	sprintf(p, "%s%c%x",