diff --git a/src/OT/Layout/Common/CoverageFormat1.hh b/src/OT/Layout/Common/CoverageFormat1.hh
index dd418b0bc..cdba7a505 100644
--- a/src/OT/Layout/Common/CoverageFormat1.hh
+++ b/src/OT/Layout/Common/CoverageFormat1.hh
@@ -103,7 +103,7 @@ struct CoverageFormat1_3
         intersect_glyphs << glyphArray[i];
   }
 
-  unsigned cost () const { return 1; }
+  unsigned cost () const { return hb_bit_storage ((unsigned) glyphArray.len); /* bsearch cost */ }
 
   template <typename set_t>
   bool collect_coverage (set_t *glyphs) const