diff --git a/quiche/common/quiche_feature_flags_list.h b/quiche/common/quiche_feature_flags_list.h
index 33252e7..8c8c60d 100755
--- a/quiche/common/quiche_feature_flags_list.h
+++ b/quiche/common/quiche_feature_flags_list.h
@@ -12,7 +12,7 @@
 QUICHE_FLAG(bool, quiche_reloadable_flag_enable_tls_trust_anchor_ids, true, true, "When true, QUIC client and server will support TLS Trust Anchor IDs.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_act_upon_invalid_header, true, true, "If true, reject or send error response code upon receiving invalid request or response headers.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_add_stream_info_to_idle_close_detail, false, true, "If true, include stream information in idle timeout connection close detail.")
-QUICHE_FLAG(bool, quiche_reloadable_flag_quic_allow_client_enabled_2x_initial_cwnd, false, true, "Doubles the initial congestion window for QUIC connections when initiated by the client")
+QUICHE_FLAG(bool, quiche_reloadable_flag_quic_allow_client_enabled_2x_initial_cwnd, true, true, "Doubles the initial congestion window for QUIC connections when initiated by the client")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_allow_client_enabled_bbr_v2, true, true, "If true, allow client to enable BBRv2 on server via connection option 'B2ON'.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_bbr2_extra_acked_window, false, true, "When true, the BBR4 copt sets the extra_acked window to 20 RTTs and BBR5 sets it to 40 RTTs.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_bbr2_probe_two_rounds, true, true, "When true, the BB2U copt causes BBR2 to wait two rounds with out draining the queue before exiting PROBE_UP and BB2S has the same effect in STARTUP.")