diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index a9d584f..2e974e5 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -120,7 +120,7 @@
 // When the STMP connection option is sent by the client, timestamps in the QUIC ACK frame are sent and processed.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_send_timestamps, false)
 // When true, QuicDispatcher will silently drop QUIC packets that have invalid flags.
-QUIC_FLAG(FLAGS_quic_restart_flag_quic_drop_invalid_flags, false)
+QUIC_FLAG(FLAGS_quic_restart_flag_quic_drop_invalid_flags, true)
 // When true, defaults to BBR congestion control instead of Cubic.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_default_to_bbr, false)
 // When true, prevents QUIC\'s PacingSender from generating bursts when the congestion controller is CWND limited and not pacing limited.