diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index 4d9c0b5..f6dbfcf 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -16,7 +16,7 @@
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_support_max_bootstrap_cwnd, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_use_post_inflight_to_detect_queuing, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_bbr2_use_tcp_inflight_hi_headroom, true)
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_can_send_ack_frequency, false)
+QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_can_send_ack_frequency, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_check_keys_before_writing, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_clean_up_spdy_session_destructor, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_close_connection_in_on_can_write_with_blocked_writer, true)