diff --git a/quic/core/quic_versions.h b/quic/core/quic_versions.h
index cc780b4..160adeb 100644
--- a/quic/core/quic_versions.h
+++ b/quic/core/quic_versions.h
@@ -145,6 +145,8 @@
     return handshake_protocol != other.handshake_protocol ||
            transport_version != other.transport_version;
   }
+
+  bool KnowsWhichDecrypterToUse() const;
 };
 
 QUIC_EXPORT_PRIVATE ParsedQuicVersion UnsupportedQuicVersion();