diff --git a/src/core/ext/transport/cronet/transport/cronet_transport.cc b/src/core/ext/transport/cronet/transport/cronet_transport.cc
index d215ed860c5..1b8c3d117cf 100644
--- a/src/core/ext/transport/cronet/transport/cronet_transport.cc
+++ b/src/core/ext/transport/cronet/transport/cronet_transport.cc
@@ -119,8 +119,7 @@ static bidirectional_stream_callback cronet_callbacks = {
     on_canceled};
 
 // Cronet transport object
-struct grpc_cronet_transport final : public grpc_core::Transport,
-                                     public grpc_core::FilterStackTransport {
+struct grpc_cronet_transport final : public grpc_core::FilterStackTransport {
   FilterStackTransport* filter_stack_transport() override { return this; }
   grpc_core::ClientTransport* client_transport() override { return nullptr; }
   grpc_core::ServerTransport* server_transport() override { return nullptr; }
diff --git a/src/core/lib/transport/transport.h b/src/core/lib/transport/transport.h
index eafd39c46d8..65f57fdd475 100644
--- a/src/core/lib/transport/transport.h
+++ b/src/core/lib/transport/transport.h
@@ -569,7 +569,7 @@ class FilterStackTransport : public Transport {
                              grpc_closure* then_schedule_closure) = 0;
 
  protected:
-  ~FilterStackTransport() = default;
+  ~FilterStackTransport() override = default;
 };
 
 class ClientTransport : public Transport {
@@ -577,7 +577,7 @@ class ClientTransport : public Transport {
   virtual void StartCall(CallHandler call_handler) = 0;
 
  protected:
-  ~ClientTransport() = default;
+  ~ClientTransport() override = default;
 };
 
 class ServerTransport : public Transport {
@@ -602,7 +602,7 @@ class ServerTransport : public Transport {
   virtual void SetAcceptor(Acceptor* acceptor) = 0;
 
  protected:
-  ~ServerTransport() = default;
+  ~ServerTransport() override = default;
 };
 
 }  // namespace grpc_core