diff --git a/include/fcntl.h b/include/fcntl.h
index 1fba777debf9e319531a81c5762c7c06cd10baf0..af2934057dfdd2debd2d4622711e905135938c1a 100644
--- a/include/fcntl.h
+++ b/include/fcntl.h
@@ -129,6 +129,7 @@ int posix_fallocate(int, off_t, off_t);
 #define F_SEAL_SHRINK	0x0002
 #define F_SEAL_GROW	0x0004
 #define F_SEAL_WRITE	0x0008
+#define F_SEAL_FUTURE_WRITE	0x0010
 
 #define F_GET_RW_HINT		1035
 #define F_SET_RW_HINT		1036