diff --git a/ssl/internal.h b/ssl/internal.h
index ac3a844..04bf7a4 100644
--- a/ssl/internal.h
+++ b/ssl/internal.h
@@ -3548,6 +3548,9 @@
   // is_server is whether this session was created by a server.
   bool is_server : 1;
 
+  // is_quic indicates whether this session was created using QUIC.
+  bool is_quic : 1;
+
  private:
   ~ssl_session_st();
   friend void SSL_SESSION_free(SSL_SESSION *);