diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index bfa9f10..42574c8 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -12,7 +12,7 @@
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_allocate_stream_sequencer_buffer_blocks_on_demand, false)
 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_bw_startup, false)
+QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_bw_startup, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_disable_reno_coexistence, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_fewer_startup_round_trips, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_reset_max_bytes_delivered, false)