diff --git a/src/libraries/System.Net.Http/tests/StressTests/HttpStress/StressServer.cs b/src/libraries/System.Net.Http/tests/StressTests/HttpStress/StressServer.cs
index c4c05ee6fb1f0..e994e7ed15cb2 100644
--- a/src/libraries/System.Net.Http/tests/StressTests/HttpStress/StressServer.cs
+++ b/src/libraries/System.Net.Http/tests/StressTests/HttpStress/StressServer.cs
@@ -127,7 +127,7 @@ void ConfigureListenOptions(ListenOptions listenOptions)
                 {
                     host = host.UseQuic(options =>
                     {
-                        options.Alpn = SslApplicationProtocol.Http3.ToString();
+                        options.Alpn = "h3";
                         options.IdleTimeout = TimeSpan.FromMinutes(1);
                     });
                 }