diff --git a/include/sys/zfs_vfsops.h b/include/sys/zfs_vfsops.h
index 33ecf72fbb..4dd46710f7 100644
--- a/include/sys/zfs_vfsops.h
+++ b/include/sys/zfs_vfsops.h
@@ -87,7 +87,7 @@ typedef struct zfs_sb {
 	uint64_t	z_groupquota_obj;
 	uint64_t	z_replay_eof;	/* New end of file - replay only */
 	sa_attr_type_t	*z_attr_table;	/* SA attr mapping->id */
-#define	ZFS_OBJ_MTX_SZ	64
+#define	ZFS_OBJ_MTX_SZ	256
 	kmutex_t	z_hold_mtx[ZFS_OBJ_MTX_SZ];	/* znode hold locks */
 } zfs_sb_t;