diff --git a/test/core/xds/xds_client_test.cc b/test/core/xds/xds_client_test.cc
index 4567dad47f6..aeaaa761533 100644
--- a/test/core/xds/xds_client_test.cc
+++ b/test/core/xds/xds_client_test.cc
@@ -82,6 +82,7 @@ class XdsClientTest : public ::testing::Test {
    public:
     class FakeNode : public Node {
      public:
+      FakeNode() = default;
       const std::string& id() const override { return id_; }
       const std::string& cluster() const override { return cluster_; }
       const std::string& locality_region() const override {