diff --git a/quiche/common/quiche_feature_flags_list.h b/quiche/common/quiche_feature_flags_list.h
index cd411f3..b6784b1 100755
--- a/quiche/common/quiche_feature_flags_list.h
+++ b/quiche/common/quiche_feature_flags_list.h
@@ -50,7 +50,7 @@
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_testonly_default_false, false, "A testonly reloadable flag that will always default to false.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_testonly_default_true, true, "A testonly reloadable flag that will always default to true.")
 QUICHE_FLAG(bool, quiche_reloadable_flag_quic_use_received_client_addresses_cache, true, "If true, use a LRU cache to record client addresses of packets received on server's original address.")
-QUICHE_FLAG(bool, quiche_restart_flag_quic_opport_bundle_qpack_decoder_data5, false, "If true, bundle qpack decoder data with other frames opportunistically.")
+QUICHE_FLAG(bool, quiche_restart_flag_quic_opport_bundle_qpack_decoder_data5, true, "If true, bundle qpack decoder data with other frames opportunistically.")
 QUICHE_FLAG(bool, quiche_restart_flag_quic_support_ect1, false, "When true, allows sending of QUIC packets marked ECT(1). A different flag (TBD) will actually utilize this capability to send ECT(1).")
 QUICHE_FLAG(bool, quiche_restart_flag_quic_support_release_time_for_gso, false, "If true, QuicGsoBatchWriter will support release time if it is available and the process has the permission to do so.")
 QUICHE_FLAG(bool, quiche_restart_flag_quic_testonly_default_false, false, "A testonly restart flag that will always default to false.")