diff --git a/fs/xfs/libxfs/xfs_rtrmap_btree.c b/fs/xfs/libxfs/xfs_rtrmap_btree.c
index 0cb2113d5b40..a15e460a1ec7 100644
--- a/fs/xfs/libxfs/xfs_rtrmap_btree.c
+++ b/fs/xfs/libxfs/xfs_rtrmap_btree.c
@@ -618,7 +618,7 @@ xfs_rtrmapbt_mem_cursor(
 	struct xfs_btree_cur	*cur;
 
 	cur = xfs_btree_alloc_cursor(mp, tp, &xfs_rtrmapbt_mem_ops,
-			mp->m_rtrmap_maxlevels, xfs_rtrmapbt_cur_cache);
+			xfs_rtrmapbt_maxlevels_ondisk(), xfs_rtrmapbt_cur_cache);
 	cur->bc_mem.xfbtree = xfbt;
 	cur->bc_nlevels = xfbt->nlevels;
 	cur->bc_group = xfs_group_hold(rtg_group(rtg));