diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index a4f0cca..8beff10 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -48,7 +48,7 @@
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_fix_willing_and_able_to_write2, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_h3_datagram, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_pass_path_response_to_validator, false)
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_preempt_stream_data_with_handshake_packet, false)
+QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_preempt_stream_data_with_handshake_packet, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_reject_unexpected_ietf_frame_types, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_require_handshake_confirmation, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_send_path_response2, false)