diff --git a/include/hashed_db.h b/include/hashed_db.h
index 1ae29b0..584fd96 100644
--- a/include/hashed_db.h
+++ b/include/hashed_db.h
@@ -1,5 +1,6 @@
 /****************************************************************************
- * Copyright (c) 2006 Free Software Foundation, Inc.                        *
+ * Copyright 2020 Thomas E. Dickey                                          *
+ * Copyright 2006-2014,2017 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            *
@@ -31,12 +32,14 @@
  ****************************************************************************/
 
 /*
- * $Id: hashed_db.h,v 1.6 2014/04/12 22:41:10 tom Exp $
+ * $Id: hashed_db.h,v 1.9 2020/02/02 23:34:34 tom Exp $
  */
 
 #ifndef HASHED_DB_H
 #define HASHED_DB_H 1
 
+#include <ncurses_cfg.h>
+
 #include <curses.h>
 
 #if USE_HASHED_DB
@@ -45,7 +48,7 @@
 
 #include <db.h>
 
-#ifndef DBN_SUFFIX
+#ifndef DBM_SUFFIX
 #define DBM_SUFFIX ".db"
 #endif