diff --git a/bin/tests/shutdown_test.c b/bin/tests/shutdown_test.c
index 11f6aacc6e..923aac0230 100644
--- a/bin/tests/shutdown_test.c
+++ b/bin/tests/shutdown_test.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1998-2001, 2004, 2007, 2011, 2013, 2016, 2017  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 1998-2001, 2004, 2007, 2011, 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
@@ -139,7 +139,7 @@ new_task(isc_mem_t *mctx, const char *name) {
 		INSIST(strlen(name) < sizeof(ti->name));
 		strlcpy(ti->name, name, sizeof(ti->name));
 	} else {
-		snprintf(ti->name, sizeof(ti->name), "%d", task_count);
+		snprintf(ti->name, sizeof(ti->name), "%u", task_count);
 	}
 	RUNTIME_CHECK(isc_task_create(task_manager, 0, &ti->task) ==
 		      ISC_R_SUCCESS);
@@ -175,7 +175,7 @@ main(int argc, char *argv[]) {
 			workers = 8192;
 	} else
 		workers = 2;
-	printf("%d workers\n", workers);
+	printf("%u workers\n", workers);
 
 	mctx = NULL;
 	RUNTIME_CHECK(isc_mem_create(0, 0, &mctx) == ISC_R_SUCCESS);
diff --git a/util/copyrights b/util/copyrights
index dd1bf2988f..b6b1f139a7 100644
--- a/util/copyrights
+++ b/util/copyrights
@@ -600,7 +600,7 @@
 ./bin/tests/resolver/win32/t_resolver.vcxproj.user	X	2013
 ./bin/tests/rwlock_test.c C 1998,1999,2000,2001,2004,2005,2007,2013,2016,2017,2018
 ./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/shutdown_test.c C 1998,1999,2000,2001,2004,2007,2011,2013,2016,2017,2018
 ./bin/tests/sig0_test.c				C	2000,2001,2004,2005,2007,2008,2009,2012,2015,2016
 ./bin/tests/sock_test.c				C	1998,1999,2000,2001,2004,2007,2008,2012,2013,2014,2015,2016,2017
 ./bin/tests/sockaddr/Makefile.in		MAKE	1999,2000,2001,2002,2004,2007,2009,2012,2014,2016,2017