diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index 584946a..e7d42de 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -8,7 +8,7 @@
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_abort_qpack_on_stream_reset, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_ack_delay_alarm_granularity, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_add_stream_info_to_idle_close_detail, true)
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_allocate_stream_sequencer_buffer_blocks_on_demand, false)
+QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_allocate_stream_sequencer_buffer_blocks_on_demand, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_allow_client_enabled_bbr_v2, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_avoid_too_low_probe_bw_cwnd, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_fewer_startup_round_trips, false)