diff --git a/src/OT/Layout/Common/CoverageFormat2.hh b/src/OT/Layout/Common/CoverageFormat2.hh
index 6ea8b2278..f4e3ad0e1 100644
--- a/src/OT/Layout/Common/CoverageFormat2.hh
+++ b/src/OT/Layout/Common/CoverageFormat2.hh
@@ -144,7 +144,7 @@ struct CoverageFormat2_4
   {
     for (const auto& range : rangeRecord)
     {
-      unsigned last = range.last;
+      hb_codepoint_t last = range.last;
       for (hb_codepoint_t g = range.first - 1;
            glyphs.next (&g) && g <= last;)
         intersect_glyphs << g;