diff --git a/quic/core/quic_flags_list.h b/quic/core/quic_flags_list.h
index 9ad90f4..5105d90 100644
--- a/quic/core/quic_flags_list.h
+++ b/quic/core/quic_flags_list.h
@@ -94,7 +94,7 @@
 // If true, quic dispatcher supports one connection to use multiple connection IDs. 
 QUIC_FLAG(FLAGS_quic_restart_flag_quic_dispatcher_support_multiple_cid_per_connection_v2, true)
 // If true, quic server will send ENABLE_CONNECT_PROTOCOL setting and and endpoint will validate required request/response headers and extended CONNECT mechanism and update code counts of valid/invalid headers.
-QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_verify_request_headers_2, false)
+QUIC_FLAG(FLAGS_quic_reloadable_flag_quic_verify_request_headers_2, true)
 // If true, record addresses that server has sent reset to recently, and do not send reset if the address lives in the set.
 QUIC_FLAG(FLAGS_quic_restart_flag_quic_use_recent_reset_addresses, true)
 // If true, reject or send error response code upon receiving invalid request or response headers. This flag depends on --gfe2_reloadable_flag_quic_verify_request_headers_2.