diff --git a/include/linux/tty.h b/include/linux/tty.h
index 60478f6..274b40ff 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -81,11 +81,6 @@
 	int memory_used;		/* Buffer space used excluding free queue */
 };
 /*
- * The pty uses char_buf and flag_buf as a contiguous buffer
- */
-#define PTY_BUF_SIZE	4*TTY_FLIPBUF_SIZE
-
-/*
  * When a break, frame error, or parity error happens, these codes are
  * stuffed into the flags buffer.
  */