diff --git a/src/hb-set-private.hh b/src/hb-set-private.hh
index df4325afd..c970b89dd 100644
--- a/src/hb-set-private.hh
+++ b/src/hb-set-private.hh
@@ -313,13 +313,13 @@ struct hb_set_t
     b = nb;
     for (; a && b; )
     {
-      if (page_map[a].major == other->page_map[b].major)
+      if (page_map[a - 1].major == other->page_map[b - 1].major)
       {
 	a--;
 	b--;
         Op::process (page_at (--count).v, page_at (a).v, other->page_at (b).v);
       }
-      else if (page_map[a].major > other->page_map[b].major)
+      else if (page_map[a - 1].major > other->page_map[b - 1].major)
       {
         a--;
         if (Op::passthru_left)