diff --git a/test/network/cross_traffic_unittest.cc b/test/network/cross_traffic_unittest.cc
index cfa80cd1ff..94a2dffd1e 100644
--- a/test/network/cross_traffic_unittest.cc
+++ b/test/network/cross_traffic_unittest.cc
@@ -126,8 +126,9 @@ TEST(TcpMessageRouteTest, DeliveredOnLossyNetwork) {
   auto ret = send;
   ret.loss_percent = 10;
 
-  auto* tcp_route = net.CreateTcpRoute({net.CreateEmulatedNode(send)},
-                                       {net.CreateEmulatedNode(ret)});
+  auto* tcp_route =
+      net.CreateTcpRoute(net.CreateRoute({net.CreateEmulatedNode(send)}),
+                         net.CreateRoute({net.CreateEmulatedNode(ret)}));
   int deliver_count = 0;
   // 100 kB is more than what fits into a single packet.
   constexpr size_t kMessageSize = 100000;
diff --git a/test/network/network_emulation_manager.cc b/test/network/network_emulation_manager.cc
index b2ccddf24a..a2d8d90d67 100644
--- a/test/network/network_emulation_manager.cc
+++ b/test/network/network_emulation_manager.cc
@@ -229,10 +229,10 @@ FakeTcpCrossTraffic* NetworkEmulationManagerImpl::StartFakeTcpCrossTraffic(
 }
 
 TcpMessageRoute* NetworkEmulationManagerImpl::CreateTcpRoute(
-    std::vector<EmulatedNetworkNode*> send_link,
-    std::vector<EmulatedNetworkNode*> ret_link) {
-  auto tcp_route = std::make_unique<TcpMessageRoute>(
-      clock_, task_queue_.Get(), CreateRoute(send_link), CreateRoute(ret_link));
+    EmulatedRoute* send_route,
+    EmulatedRoute* ret_route) {
+  auto tcp_route = std::make_unique<TcpMessageRoute>(clock_, task_queue_.Get(),
+                                                     send_route, ret_route);
   auto* route_ptr = tcp_route.get();
   task_queue_.PostTask([this, tcp_route = std::move(tcp_route)]() mutable {
     tcp_message_routes_.push_back(std::move(tcp_route));
diff --git a/test/network/network_emulation_manager.h b/test/network/network_emulation_manager.h
index 8076e6cea2..da5b29553b 100644
--- a/test/network/network_emulation_manager.h
+++ b/test/network/network_emulation_manager.h
@@ -77,8 +77,8 @@ class NetworkEmulationManagerImpl : public NetworkEmulationManager {
       std::vector<EmulatedNetworkNode*> ret_link,
       FakeTcpConfig config);
 
-  TcpMessageRoute* CreateTcpRoute(std::vector<EmulatedNetworkNode*> send_link,
-                                  std::vector<EmulatedNetworkNode*> ret_link);
+  TcpMessageRoute* CreateTcpRoute(EmulatedRoute* send_route,
+                                  EmulatedRoute* ret_route);
 
   void StopCrossTraffic(FakeTcpCrossTraffic* traffic);