diff --git a/src/hb-open-type-private.hh b/src/hb-open-type-private.hh
index 5a01a81d3..79ac7198c 100644
--- a/src/hb-open-type-private.hh
+++ b/src/hb-open-type-private.hh
@@ -949,9 +949,9 @@ struct HeadlessArrayOf
 
 
 /* An array with sorted elements.  Supports binary searching. */
-template <typename Type>
-struct SortedArrayOf : ArrayOf<Type> {
-
+template <typename LenType, typename Type>
+struct GenericSortedArrayOf : GenericArrayOf<LenType, Type>
+{
   template <typename SearchType>
   inline int search (const SearchType &x) const
   {
@@ -972,6 +972,10 @@ struct SortedArrayOf : ArrayOf<Type> {
   }
 };
 
+/* A sorted array with a USHORT number of elements. */
+template <typename Type>
+struct SortedArrayOf : GenericSortedArrayOf<USHORT, Type> {};
+
 
 } /* namespace OT */