diff --git a/src/vim.h b/src/vim.h
index 7d76504..4d6f934 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -941,6 +941,7 @@
 #define BLN_LISTED	2	/* put new buffer in buffer list */
 #define BLN_DUMMY	4	/* allocating dummy buffer */
 #define BLN_NEW		8	/* create a new buffer */
+#define BLN_NOOPT	16	/* don't copy options to existing buffer */
 
 /* Values for in_cinkeys() */
 #define KEY_OPEN_FORW	0x101