diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index 2199105..98867a8 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -48,7 +48,7 @@
 // If true, default-enable 5RTO blachole detection.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_default_enable_5rto_blackhole_detection2, true)
 // If true, delay block allocation in QuicStreamSequencerBuffer until there is actually new data available.
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_delay_sequencer_buffer_allocation_until_new_data, false)
+QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_delay_sequencer_buffer_allocation_until_new_data, true)
 // If true, disable QUIC version Q043.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_disable_version_q043, false)
 // If true, disable QUIC version Q046.