diff --git a/fs/xfs/xfs_ialloc_btree.c b/fs/xfs/xfs_ialloc_btree.c
index 18867f1..fc6db94 100644
--- a/fs/xfs/xfs_ialloc_btree.c
+++ b/fs/xfs/xfs_ialloc_btree.c
@@ -2160,6 +2160,9 @@
 #endif /* XFS_BTREE_TRACE */
 
 static const struct xfs_btree_ops xfs_inobt_ops = {
+	.rec_len		= sizeof(xfs_inobt_rec_t),
+	.key_len		= sizeof(xfs_inobt_key_t),
+
 	.dup_cursor		= xfs_inobt_dup_cursor,
 	.get_maxrecs		= xfs_inobt_get_maxrecs,