diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index 0f4fd18..c44f213 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -82,7 +82,7 @@
 // If true, include stream information in idle timeout connection close detail.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_add_stream_info_to_idle_close_detail, true)
 // If true, increase the size of stream sequencer buffer block container on demand.
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_allocate_stream_sequencer_buffer_blocks_on_demand, false)
+QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_allocate_stream_sequencer_buffer_blocks_on_demand, true)
 // If true, looks up session to close via connection ID managed by self_issued_connection_id_manager instead of the one on default path.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_use_active_cid_for_session_lookup, true)
 // If true, pass the received PATH_RESPONSE payload to path validator to move forward the path validation.