diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index 002dd3b..64e87ff 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -104,7 +104,7 @@
 // If true, time_wait_list can support multiple connection IDs.
 QUIC_FLAG(FLAGS_quic_restart_flag_quic_time_wait_list_support_multiple_cid_v2, true)
 // If true, update ACK timeout for NEW_CONNECTION_ID and RETIRE_CONNECTION_ID frames.
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_ack_cid_frames, true)
+QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_ack_cid_frames, false)
 // If true, upon receiving path challenge, send path response and reverse path challenge in the same function.
 QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_group_path_response_and_challenge_sending_closer, true)
 // If true, use BBRv2 as the default congestion controller. Takes precedence over --quic_default_to_bbr.