diff --git a/src/hb-ot-os2-unicode-ranges.hh b/src/hb-ot-os2-unicode-ranges.hh
index a456ffddb..a3ad4d344 100644
--- a/src/hb-ot-os2-unicode-ranges.hh
+++ b/src/hb-ot-os2-unicode-ranges.hh
@@ -33,8 +33,8 @@
 namespace OT {
 
 struct Range {
-  unsigned int start;
-  unsigned int end;
+  hb_codepoint_t start;
+  hb_codepoint_t end;
   unsigned int bit;
 };