diff --git a/quiche/quic/qbone/qbone_server_session.h b/quiche/quic/qbone/qbone_server_session.h
index 0468e7c..c313816 100644
--- a/quiche/quic/qbone/qbone_server_session.h
+++ b/quiche/quic/qbone/qbone_server_session.h
@@ -73,7 +73,7 @@
   std::unique_ptr<QuicCryptoStream> CreateCryptoStream() override;
 
   // Instantiates QboneServerControlStream.
-  void CreateControlStream();
+  virtual void CreateControlStream();
 
   // Instantiates QboneServerControlStream from the pending stream and returns a
   // pointer to it.