diff --git a/quic/quartc/quartc_crypto_helpers.h b/quic/quartc/quartc_crypto_helpers.h
index 8f0fe96..92c68b6 100644
--- a/quic/quartc/quartc_crypto_helpers.h
+++ b/quic/quartc/quartc_crypto_helpers.h
@@ -99,7 +99,8 @@
 };
 
 // Implementation of the server-side crypto stream helper.
-class QuartcCryptoServerStreamHelper : public QuicCryptoServerStream::Helper {
+class QuartcCryptoServerStreamHelper
+    : public QuicCryptoServerStreamBase::Helper {
  public:
   bool CanAcceptClientHello(const CryptoHandshakeMessage& message,
                             const QuicSocketAddress& client_address,
diff --git a/quic/quartc/quartc_dispatcher.cc b/quic/quartc/quartc_dispatcher.cc
index 8f0f1c1..c5c4c4a 100644
--- a/quic/quartc/quartc_dispatcher.cc
+++ b/quic/quartc/quartc_dispatcher.cc
@@ -16,7 +16,7 @@
     std::unique_ptr<QuicCryptoServerConfig> crypto_config,
     QuicVersionManager* version_manager,
     std::unique_ptr<QuicConnectionHelperInterface> helper,
-    std::unique_ptr<QuicCryptoServerStream::Helper> session_helper,
+    std::unique_ptr<QuicCryptoServerStreamBase::Helper> session_helper,
     std::unique_ptr<QuicAlarmFactory> alarm_factory,
     std::unique_ptr<QuartcPacketWriter> packet_writer,
     Delegate* delegate)
diff --git a/quic/quartc/quartc_dispatcher.h b/quic/quartc/quartc_dispatcher.h
index 7ac3dae..47630f9 100644
--- a/quic/quartc/quartc_dispatcher.h
+++ b/quic/quartc/quartc_dispatcher.h
@@ -34,7 +34,7 @@
       std::unique_ptr<QuicCryptoServerConfig> crypto_config,
       QuicVersionManager* version_manager,
       std::unique_ptr<QuicConnectionHelperInterface> helper,
-      std::unique_ptr<QuicCryptoServerStream::Helper> session_helper,
+      std::unique_ptr<QuicCryptoServerStreamBase::Helper> session_helper,
       std::unique_ptr<QuicAlarmFactory> alarm_factory,
       std::unique_ptr<QuartcPacketWriter> packet_writer,
       Delegate* delegate);
diff --git a/quic/quartc/quartc_session.cc b/quic/quartc/quartc_session.cc
index 9efe659..6715ee2 100644
--- a/quic/quartc/quartc_session.cc
+++ b/quic/quartc/quartc_session.cc
@@ -429,7 +429,7 @@
     const QuicClock* clock,
     const QuicCryptoServerConfig* server_crypto_config,
     QuicCompressedCertsCache* const compressed_certs_cache,
-    QuicCryptoServerStream::Helper* const stream_helper)
+    QuicCryptoServerStreamBase::Helper* const stream_helper)
     : QuartcSession(std::move(connection),
                     visitor,
                     config,
diff --git a/quic/quartc/quartc_session.h b/quic/quartc/quartc_session.h
index 1d8554f..a9ebb47 100644
--- a/quic/quartc/quartc_session.h
+++ b/quic/quartc/quartc_session.h
@@ -308,7 +308,7 @@
                       const QuicClock* clock,
                       const QuicCryptoServerConfig* server_crypto_config,
                       QuicCompressedCertsCache* const compressed_certs_cache,
-                      QuicCryptoServerStream::Helper* const stream_helper);
+                      QuicCryptoServerStreamBase::Helper* const stream_helper);
   QuartcServerSession(const QuartcServerSession&) = delete;
   QuartcServerSession& operator=(const QuartcServerSession&) = delete;
 
@@ -327,7 +327,7 @@
   QuicCompressedCertsCache* const compressed_certs_cache_;
 
   // This helper is needed to create QuicCryptoServerStream.
-  QuicCryptoServerStream::Helper* const stream_helper_;
+  QuicCryptoServerStreamBase::Helper* const stream_helper_;
 
   // Server perspective crypto stream.
   std::unique_ptr<QuicCryptoServerStreamBase> crypto_stream_;