diff --git a/src/internet-node/udp-socket.cc b/src/internet-node/udp-socket.cc
index fea3feef4..c73ff94e1 100644
--- a/src/internet-node/udp-socket.cc
+++ b/src/internet-node/udp-socket.cc
@@ -426,6 +426,7 @@ UdpSocketTest::RunTests (void)
   Ptr<PointToPointNetDevice> txDev;
   {
     txDev = CreateObjectWith<PointToPointNetDevice> ("Node", txNode, "Address", Mac48Address::Allocate ());
+    txNode->AddDevice (txDev);
     txDev->AddQueue(CreateObject<DropTailQueue> ());
     Ptr<Ipv4> ipv4 = txNode->GetObject<Ipv4> ();
     uint32_t netdev_idx = ipv4->AddInterface (txDev);