diff --git a/tests/auto/network/kernel/qdnslookup/tst_qdnslookup.cpp b/tests/auto/network/kernel/qdnslookup/tst_qdnslookup.cpp
index 411975c31ad..cd02c494e9e 100644
--- a/tests/auto/network/kernel/qdnslookup/tst_qdnslookup.cpp
+++ b/tests/auto/network/kernel/qdnslookup/tst_qdnslookup.cpp
@@ -558,7 +558,8 @@ void tst_QDnsLookup::setNameserverLoopback()
     QByteArray reply = data;
     reply[2] = 0x80U;   // header->qr = true;
     reply[3] = 3;       // header->rcode = NXDOMAIN;
-    server.writeDatagram(dgram.makeReply(reply));
+    server.writeDatagram(reply.constData(), reply.size(), dgram.senderAddress(),
+                         dgram.senderPort());
     server.close();
 
     // now check that the QDnsLookup finished