diff --git a/bin/tests/system/doth/ns1/named.conf.in b/bin/tests/system/doth/ns1/named.conf.in
index 4510229056..6ce3675f8c 100644
--- a/bin/tests/system/doth/ns1/named.conf.in
+++ b/bin/tests/system/doth/ns1/named.conf.in
@@ -19,6 +19,7 @@ controls {
 
 http local {
 	endpoints { "/dns-query"; "/alter"; };
+	listener-clients 100;
 };
 
 tls tls-forward-secrecy {