diff --git a/src/graph/markbasepos-graph.hh b/src/graph/markbasepos-graph.hh
index e10e1cf3e..ae5ebd0d1 100644
--- a/src/graph/markbasepos-graph.hh
+++ b/src/graph/markbasepos-graph.hh
@@ -217,7 +217,7 @@ struct MarkBasePosFormat1 : public OT::Layout::GPOS_impl::MarkBasePosFormat1_2<S
 
     const unsigned base_coverage_id = c.graph.index_for_offset (this_index, &baseCoverage);
     const unsigned base_size =
-        OT::Layout::GPOS_impl::PairPosFormat1_3<SmallTypes>::min_size +
+        OT::Layout::GPOS_impl::MarkBasePosFormat1_2<SmallTypes>::min_size +
         MarkArray::min_size +
         AnchorMatrix::min_size +
         c.graph.vertices_[base_coverage_id].table_size ();
@@ -484,7 +484,7 @@ struct MarkBasePos : public OT::Layout::GPOS_impl::MarkBasePos
       return ((MarkBasePosFormat1*)(&u.format1))->split_subtables (c, parent_index, this_index);
 #ifndef HB_NO_BEYOND_64K
     case 2: HB_FALLTHROUGH;
-      // Don't split 24bit PairPos's.
+      // Don't split 24bit MarkBasePos's.
 #endif
     default:
       return hb_vector_t<unsigned> ();