diff --git a/quic/test_tools/crypto_test_utils.cc b/quic/test_tools/crypto_test_utils.cc
index 83efd21..6716dec 100644
--- a/quic/test_tools/crypto_test_utils.cc
+++ b/quic/test_tools/crypto_test_utils.cc
@@ -235,8 +235,10 @@
       server_conn, *server_quic_config, client_conn->supported_versions(),
       crypto_config, &compressed_certs_cache);
   server_session.Initialize();
-  server_session.OnSuccessfulVersionNegotiation(
-      client_conn->supported_versions().front());
+  if (!GetQuicReloadableFlag(quic_version_negotiated_by_default_at_server)) {
+    server_session.OnSuccessfulVersionNegotiation(
+        client_conn->supported_versions().front());
+  }
   EXPECT_CALL(*server_session.helper(),
               CanAcceptClientHello(testing::_, testing::_, testing::_,
                                    testing::_, testing::_))