diff --git a/src/hb-ot-layout-common.hh b/src/hb-ot-layout-common.hh
index 22d6079ba27b6f8c8b6e466025da7763a767bf71..b8ac7381c171334f78db22ce32178883b722f624 100644
--- a/src/hb-ot-layout-common.hh
+++ b/src/hb-ot-layout-common.hh
@@ -1105,7 +1105,7 @@ struct Coverage
   }
 
   struct Iter :
-    hb_iter_t<Iter, const hb_pair_t<unsigned, hb_codepoint_t> >,
+    hb_sorted_iter_t<Iter, const hb_pair_t<unsigned, hb_codepoint_t> >,
     hb_iter_mixin_t<Iter, const hb_pair_t<unsigned, hb_codepoint_t> >
   {
     Iter (const Coverage &c_)