diff --git a/quic/test_tools/crypto_test_utils.h b/quic/test_tools/crypto_test_utils.h
index 421c0f3d..4cee641 100644
--- a/quic/test_tools/crypto_test_utils.h
+++ b/quic/test_tools/crypto_test_utils.h
@@ -69,7 +69,8 @@
                             MockQuicConnectionHelper* helper,
                             MockAlarmFactory* alarm_factory,
                             PacketSavingConnection* client_conn,
-                            QuicCryptoClientStream* client);
+                            QuicCryptoClientStream* client,
+                            std::string alpn);
 
 // returns: the number of client hellos that the client sent.
 int HandshakeWithFakeClient(MockQuicConnectionHelper* helper,