diff --git a/quiche/common/quiche_feature_flags_list.h b/quiche/common/quiche_feature_flags_list.h
index bb6f9e5..fea0eff 100755
--- a/quiche/common/quiche_feature_flags_list.h
+++ b/quiche/common/quiche_feature_flags_list.h
@@ -24,7 +24,7 @@
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_default_enable_5rto_blackhole_detection2, true, true, "If true, default-enable 5RTO blachole detection.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_default_to_bbr, true, false, "When true, defaults to BBR congestion control instead of Cubic.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_default_to_bbr_v2, false, false, "If true, use BBRv2 as the default congestion controller. Takes precedence over --quic_default_to_bbr.")
-QUICHE_FLAG(bool, quiche_reloadable_flag_quic_delay_connection_close_on_invalid_sni, false, false, "Delay closing the connection on invalid SNI in client hello till after the transport parameters are parsed.")
+QUICHE_FLAG(bool, quiche_reloadable_flag_quic_delay_connection_close_on_invalid_sni, false, true, "Delay closing the connection on invalid SNI in client hello till after the transport parameters are parsed.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_deliver_stop_sending_to_zombie_streams, true, true, "If true, deliver STOP_SENDING to zombie streams.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_disable_batch_write, false, false, "If true, round-robin stream writes instead of batching in QuicWriteBlockedList.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_disable_server_blackhole_detection, false, false, "If true, disable blackhole detection on server side.")