diff --git a/src/hb-aat-layout-common.hh b/src/hb-aat-layout-common.hh
index 253b56fea..c0b0e3751 100644
--- a/src/hb-aat-layout-common.hh
+++ b/src/hb-aat-layout-common.hh
@@ -689,6 +689,13 @@ struct ObsoleteTypes
     return (offset - ((const char *) array - (const char *) base)) / sizeof (T);
   }
   template <typename T>
+  static inline unsigned int byteOffsetToIndex (unsigned int offset,
+						const void *base,
+						const T *array)
+  {
+    return offsetToIndex (offset, base, array);
+  }
+  template <typename T>
   static inline unsigned int wordOffsetToIndex (unsigned int offset,
 						const void *base,
 						const T *array)
@@ -712,6 +719,13 @@ struct ExtendedTypes
     return offset;
   }
   template <typename T>
+  static inline unsigned int byteOffsetToIndex (unsigned int offset,
+						const void *base,
+						const T *array)
+  {
+    return offset / 2;
+  }
+  template <typename T>
   static inline unsigned int wordOffsetToIndex (unsigned int offset,
 						const void *base,
 						const T *array)
diff --git a/src/hb-aat-layout-kerx-table.hh b/src/hb-aat-layout-kerx-table.hh
index abd577b9d..7caf45d5d 100644
--- a/src/hb-aat-layout-kerx-table.hh
+++ b/src/hb-aat-layout-kerx-table.hh
@@ -255,7 +255,7 @@ struct KerxSubTableFormat1
 	unsigned int tuple_count = MAX (1u, table->header.tuple_count ());
 
 	unsigned int kern_idx = Format1EntryT::kernActionIndex (entry);
-	kern_idx = Types::offsetToIndex (kern_idx, &table->machine, kernAction.arrayZ);
+	kern_idx = Types::byteOffsetToIndex (kern_idx, &table->machine, kernAction.arrayZ);
 	const FWORD *actions = &kernAction[kern_idx];
 	if (!c->sanitizer.check_array (actions, depth, tuple_count))
 	{