diff --git a/bin/tests/system/legacy/ns1/named1.conf.in b/bin/tests/system/legacy/ns1/named1.conf.in
index 67cac6684a..1f27935c6d 100644
--- a/bin/tests/system/legacy/ns1/named1.conf.in
+++ b/bin/tests/system/legacy/ns1/named1.conf.in
@@ -30,6 +30,14 @@ controls {
 	inet 10.53.0.1 port @CONTROLPORT@ allow { any; } keys { rndc_key; };
 };
 
+server 10.53.0.5 {
+	tcp-on-no-cookie false;
+};
+
+server 10.53.0.7 {
+	tcp-on-no-cookie false;
+};
+
 zone "." {
 	type primary;
 	file "root.db";
diff --git a/bin/tests/system/legacy/ns1/named2.conf.in b/bin/tests/system/legacy/ns1/named2.conf.in
index f918dedec4..83be400a7d 100644
--- a/bin/tests/system/legacy/ns1/named2.conf.in
+++ b/bin/tests/system/legacy/ns1/named2.conf.in
@@ -21,6 +21,14 @@ options {
 	dnssec-validation yes;
 };
 
+server 10.53.0.5 {
+	tcp-on-no-cookie false;
+};
+
+server 10.53.0.7 {
+	tcp-on-no-cookie false;
+};
+
 zone "." {
 	type primary;
 	file "root.db";