diff --git a/src/hb-ot-hdmx-table.hh b/src/hb-ot-hdmx-table.hh
index a86cc3c31..3bfd75502 100644
--- a/src/hb-ot-hdmx-table.hh
+++ b/src/hb-ot-hdmx-table.hh
@@ -76,7 +76,7 @@ struct DeviceRecord
   HBUINT8			maxWidth;	/* Maximum width. */
   UnsizedArrayOf<HBUINT8>	widthsZ;	/* Array of widths (numGlyphs is from the 'maxp' table). */
   public:
-  DEFINE_SIZE_ARRAY (2, widthsZ);
+  DEFINE_SIZE_UNBOUNDED (2);
 };
 
 
@@ -87,14 +87,6 @@ struct hdmx
   unsigned int get_size () const
   { return min_size + numRecords * sizeDeviceRecord; }
 
-  const DeviceRecord& operator [] (unsigned int i) const
-  {
-    /* XXX Null(DeviceRecord) is NOT safe as it's num-glyphs lengthed.
-     * https://github.com/harfbuzz/harfbuzz/issues/1300 */
-    if (unlikely (i >= numRecords)) return Null (DeviceRecord);
-    return StructAtOffset<DeviceRecord> (&this->firstDeviceRecord, i * sizeDeviceRecord);
-  }
-
   template<typename Iterator,
 	   hb_requires (hb_is_iterator (Iterator))>
   bool serialize (hb_serialize_context_t *c, unsigned version, Iterator it)