diff --git a/lib/dns/zone.c b/lib/dns/zone.c
index ddee2f2dfa..e6f48864e8 100644
--- a/lib/dns/zone.c
+++ b/lib/dns/zone.c
@@ -79,6 +79,8 @@
 
 #include <dst/dst.h>
 
+#include "zone_p.h"
+
 #define ZONE_MAGIC			ISC_MAGIC('Z', 'O', 'N', 'E')
 #define DNS_ZONE_VALID(zone)		ISC_MAGIC_VALID(zone, ZONE_MAGIC)
 
diff --git a/lib/dns/zone_p.h b/lib/dns/zone_p.h
new file mode 100644
index 0000000000..24329b0e49
--- /dev/null
+++ b/lib/dns/zone_p.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#ifndef DNS_ZONE_P_H
+#define DNS_ZONE_P_H
+
+/*! \file */
+
+/*%
+ *     Types and functions below not be used outside this module and its
+ *     associated unit tests.
+ */
+
+ISC_LANG_BEGINDECLS
+
+ISC_LANG_ENDDECLS
+
+#endif /* DNS_ZONE_P_H */
diff --git a/util/copyrights b/util/copyrights
index 938733a058..2779a8070a 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -3410,6 +3410,7 @@
 ./lib/dns/win32/version.c			C	1998,1999,2000,2001,2004,2007,2013,2016,2018
 ./lib/dns/xfrin.c				C	1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2011,2012,2013,2014,2015,2016,2017,2018
 ./lib/dns/zone.c				C	1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016,2017,2018
+./lib/dns/zone_p.h				C	2018
 ./lib/dns/zonekey.c				C	2001,2003,2004,2005,2007,2016,2018
 ./lib/dns/zt.c					C	1999,2000,2001,2002,2004,2005,2006,2007,2011,2012,2013,2014,2015,2016,2017,2018
 ./lib/irs/Atffile				X	2016,2018