diff --git a/c++/cursslk.cc b/c++/cursslk.cc
index 23785df..7b898ce 100644
--- a/c++/cursslk.cc
+++ b/c++/cursslk.cc
@@ -1,6 +1,7 @@
 // * this is for making emacs happy: -*-Mode: C++;-*-
 /****************************************************************************
- * Copyright (c) 1998-2005,2012 Free Software Foundation, Inc.              *
+ * Copyright 2019-2022,2023 Thomas E. Dickey                                *
+ * Copyright 1998-2005,2012 Free Software Foundation, Inc.                  *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
@@ -35,7 +36,7 @@
 #include "cursslk.h"
 #include "cursesapp.h"
 
-MODULE_ID("$Id: cursslk.cc,v 1.16 2012/02/23 10:41:56 tom Exp $")
+MODULE_ID("$Id: cursslk.cc,v 1.21 2023/02/25 23:36:06 tom Exp $")
 
 Soft_Label_Key_Set::Soft_Label_Key&
   Soft_Label_Key_Set::Soft_Label_Key::operator=(char *text)
@@ -55,7 +56,11 @@
 
 void Soft_Label_Key_Set::init()
 {
-  slk_array = new Soft_Label_Key[num_labels];
+  if (num_labels > 12)
+      num_labels = 12;
+  if (num_labels < 0)
+      num_labels = 0;
+  slk_array = new Soft_Label_Key[num_labels + 1];
   for(int i=0; i < num_labels; i++) {
     slk_array[i].num = i+1;
   }
@@ -88,7 +93,7 @@
   init();
 }
 
-Soft_Label_Key_Set::~Soft_Label_Key_Set() {
+Soft_Label_Key_Set::~Soft_Label_Key_Set() THROWS(NCursesException) {
   if (!::isendwin())
     clear();
   delete[] slk_array;
@@ -101,6 +106,10 @@
   return slk_array[i-1];
 }
 
+int Soft_Label_Key_Set::labels() const {
+  return num_labels;
+}
+
 void Soft_Label_Key_Set::activate_label(int i, bool bf) {
   if (!b_attrInit) {
     NCursesApplication* A = NCursesApplication::getApplication();