diff --git a/bin/tests/rwlock_test.c b/bin/tests/rwlock_test.c
index 5a542312e3..8cf7c708ea 100644
--- a/bin/tests/rwlock_test.c
+++ b/bin/tests/rwlock_test.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1998-2001, 2004, 2005, 2007, 2013, 2016, 2017  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 1998-2001, 2004, 2005, 2007, 2013, 2016-2018  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
@@ -104,7 +104,7 @@ main(int argc, char *argv[]) {
 		nworkers = 2;
 	if (nworkers > 100)
 		nworkers = 100;
-	printf("%d workers\n", nworkers);
+	printf("%u workers\n", nworkers);
 
 	RUNTIME_CHECK(isc_rwlock_init(&lock, 5, 10) == ISC_R_SUCCESS);
 
diff --git a/util/copyrights b/util/copyrights
index 5daefa0f70..10c20bd9bf 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -736,7 +736,7 @@
 ./bin/tests/resolver/win32/t_resolver.vcxproj.filters.in	X	2013,2015
 ./bin/tests/resolver/win32/t_resolver.vcxproj.in	X	2013,2015,2016,2017
 ./bin/tests/resolver/win32/t_resolver.vcxproj.user	X	2013
-./bin/tests/rwlock_test.c			C	1998,1999,2000,2001,2004,2005,2007,2013,2016,2017
+./bin/tests/rwlock_test.c C 1998,1999,2000,2001,2004,2005,2007,2013,2016,2017,2018
 ./bin/tests/serial_test.c			C	1999,2000,2001,2003,2004,2007,2015,2016
 ./bin/tests/shutdown_test.c			C	1998,1999,2000,2001,2004,2007,2011,2013,2016,2017
 ./bin/tests/sig0_test.c				C	2000,2001,2004,2005,2007,2008,2009,2012,2015,2016