diff --git a/include/linux/tty.h b/include/linux/tty.h
index bb44fa9ae135..7e605e4b3da3 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -23,7 +23,7 @@
  */
 #define NR_UNIX98_PTY_DEFAULT	4096      /* Default maximum for Unix98 ptys */
 #define NR_UNIX98_PTY_MAX	(1 << MINORBITS) /* Absolute limit */
-#define NR_LDISCS		21
+#define NR_LDISCS		30
 
 /* line disciplines */
 #define N_TTY		0