diff --git a/include/linux/tty.h b/include/linux/tty.h
index 60478f6e5dc6..274b40ff0cd8 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -80,11 +80,6 @@ struct tty_bufhead {
 	struct tty_buffer *free;	/* Free queue head */
 	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.