diff --git a/sys/fs/nandfs/nandfs.h b/sys/fs/nandfs/nandfs.h
index fd5978a1299b..899a7dd77743 100644
--- a/sys/fs/nandfs/nandfs.h
+++ b/sys/fs/nandfs/nandfs.h
@@ -303,8 +303,8 @@ struct nandfs_node {
 #define	PRINT_NODE_FLAGS \
 	"\10\1IN_ACCESS\2IN_CHANGE\3IN_UPDATE\4IN_MODIFIED\5IN_RENAME"
 
-#define	NANDFS_GATHER(x) ((x)->b_flags |= B_00800000)
-#define	NANDFS_UNGATHER(x) ((x)->b_flags &= ~B_00800000)
-#define	NANDFS_ISGATHERED(x) ((x)->b_flags & B_00800000)
+#define	NANDFS_GATHER(x) ((x)->b_flags |= B_FS_FLAG1)
+#define	NANDFS_UNGATHER(x) ((x)->b_flags &= ~B_FS_FLAG1)
+#define	NANDFS_ISGATHERED(x) ((x)->b_flags & B_FS_FLAG1)
 
 #endif /* !_FS_NANDFS_NANDFS_H_ */
diff --git a/sys/sys/buf.h b/sys/sys/buf.h
index c384e187493c..7185bff6472d 100644
--- a/sys/sys/buf.h
+++ b/sys/sys/buf.h
@@ -213,7 +213,7 @@ struct buf {
 #define	B_00100000	0x00100000	/* Available flag. */
 #define	B_DIRTY		0x00200000	/* Needs writing later (in EXT2FS). */
 #define	B_RELBUF	0x00400000	/* Release VMIO buffer. */
-#define	B_00800000	0x00800000	/* Available flag. */
+#define	B_FS_FLAG1	0x00800000	/* Available flag for FS use. */
 #define	B_NOCOPY	0x01000000	/* Don't copy-on-write this buf. */
 #define	B_INFREECNT	0x02000000	/* buf is counted in numfreebufs */
 #define	B_PAGING	0x04000000	/* volatile paging I/O -- bypass VMIO */