diff --git a/quic/tools/quic_simple_server_session.h b/quic/tools/quic_simple_server_session.h
index 12748ad..d485e7c 100644
--- a/quic/tools/quic_simple_server_session.h
+++ b/quic/tools/quic_simple_server_session.h
@@ -102,6 +102,8 @@
     return quic_simple_server_backend_;
   }
 
+  void MaybeInitializeHttp3UnidirectionalStreams() override;
+
  private:
   friend class test::QuicSimpleServerSessionPeer;