diff --git a/bin/tests/system/dnssec/ns3/siginterval1.conf b/bin/tests/system/dnssec/ns3/siginterval1.conf
index 092dcfa29a..397fa76b51 100644
--- a/bin/tests/system/dnssec/ns3/siginterval1.conf
+++ b/bin/tests/system/dnssec/ns3/siginterval1.conf
@@ -13,6 +13,7 @@ zone "siginterval.example" {
 	type master;
 	allow-update { any; };
 	sig-validity-interval 1 23;
+	dnskey-sig-validity 90;
 	auto-dnssec maintain;
 	file "siginterval.example.db";
 };