diff --git a/quic/core/tls_client_handshaker.h b/quic/core/tls_client_handshaker.h
index d2d0a4a..47faf81 100644
--- a/quic/core/tls_client_handshaker.h
+++ b/quic/core/tls_client_handshaker.h
@@ -52,9 +52,12 @@
   const QuicCryptoNegotiatedParameters& crypto_negotiated_params()
       const override;
   CryptoMessageParser* crypto_message_parser() override;
+  size_t BufferSizeLimitForLevel(EncryptionLevel level) const override;
 
  protected:
-  TlsConnection* tls_connection() override { return &tls_connection_; }
+  const TlsConnection* tls_connection() const override {
+    return &tls_connection_;
+  }
 
   void AdvanceHandshake() override;
   void CloseConnection(QuicErrorCode error,