diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index 4c5e947..07e8712 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -47,7 +47,7 @@
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_enable_aead_limits, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_enable_mtu_discovery_at_server, false)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_encrypted_control_frames, false)
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_extract_x509_subject_using_certificate_view, false)
+QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_extract_x509_subject_using_certificate_view, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_fix_address_validation, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_fix_arm_pto_for_application_data, true)
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_fix_http3_goaway_stream_id, true)