diff --git a/test/TestServer/Program.cs b/test/TestServer/Program.cs
index c3c9384aab..b365247e40 100644
--- a/test/TestServer/Program.cs
+++ b/test/TestServer/Program.cs
@@ -19,7 +19,7 @@ namespace TestServer
         private static async Task RunEchoServer()
         {
             HttpListener listener = new HttpListener();
-            listener.Prefixes.Add("http://*:12345/");
+            listener.Prefixes.Add("http://localhost:12345/");
             listener.Start();
             Console.WriteLine("Started");