diff --git a/src/hb-ot-cmap-table.hh b/src/hb-ot-cmap-table.hh
index 0c57d1d7d..6ab1dc597 100644
--- a/src/hb-ot-cmap-table.hh
+++ b/src/hb-ot-cmap-table.hh
@@ -930,7 +930,7 @@ struct DefaultUVS : SortedArray32Of<UnicodeValueRange>
 
     for (const UnicodeValueRange& _ : *this)
     {
-      hb_codepoint_t curEntry = (unsigned) _.startUnicodeValue - 1;
+      hb_codepoint_t curEntry = (hb_codepoint_t) (_.startUnicodeValue - 1);
       hb_codepoint_t end = curEntry + _.additionalCount + 2;
 
       for (; unicodes->next (&curEntry) && curEntry < end;)