diff --git a/bin/tests/system/checkzone/zones/bad-svcb-alpn4.db b/bin/tests/system/checkzone/zones/bad-svcb-alpn4.db
new file mode 100644
index 0000000000..5ba0850a15
--- /dev/null
+++ b/bin/tests/system/checkzone/zones/bad-svcb-alpn4.db
@@ -0,0 +1,17 @@
+; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+;
+; SPDX-License-Identifier: MPL-2.0
+;
+; 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 https://mozilla.org/MPL/2.0/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
+$TTL 600
+@		SOA	ns hostmaster 2011012708 3600 1200 604800 1200
+		NS	ns
+ns		A	192.0.2.1
+; invalid zero length alpn at start
+svcb		SVCB	1 . alpn=,abc
diff --git a/bin/tests/system/checkzone/zones/bad-svcb-alpn5.db b/bin/tests/system/checkzone/zones/bad-svcb-alpn5.db
new file mode 100644
index 0000000000..349521a0a7
--- /dev/null
+++ b/bin/tests/system/checkzone/zones/bad-svcb-alpn5.db
@@ -0,0 +1,17 @@
+; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+;
+; SPDX-License-Identifier: MPL-2.0
+;
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0.  If a copy of the MPL was not distributed with this
+; file, you can obtain one at https://mozilla.org/MPL/2.0/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
+$TTL 600
+@		SOA	ns hostmaster 2011012708 3600 1200 604800 1200
+		NS	ns
+ns		A	192.0.2.1
+; invalid zero length alpn in midddle
+svcb            SVCB    1 . alpn=a,,abc
diff --git a/bin/tests/system/checkzone/zones/bad-svcb-alpn6.db b/bin/tests/system/checkzone/zones/bad-svcb-alpn6.db
new file mode 100644
index 0000000000..ae4171013d
--- /dev/null
+++ b/bin/tests/system/checkzone/zones/bad-svcb-alpn6.db
@@ -0,0 +1,17 @@
+; Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+;
+; SPDX-License-Identifier: MPL-2.0
+;
+; 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 https://mozilla.org/MPL/2.0/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
+$TTL 600
+@		SOA	ns hostmaster 2011012708 3600 1200 604800 1200
+		NS	ns
+ns		A	192.0.2.1
+; invalid zero length alpn at end
+svcb            SVCB    1 . alpn=abc,