diff --git a/exercises/204_established_identities/platformio.ini b/exercises/204_established_identities/platformio.ini
index f4936d0..de07b41 100644
--- a/exercises/204_established_identities/platformio.ini
+++ b/exercises/204_established_identities/platformio.ini
@@ -54,6 +54,7 @@ build_flags =
   -D SIM_PHY_BLOCK_BOB_CY=1
   -D MR_TRANSPORT_PROBE=1
   -D MR_LINKFWD_DELAY_MS=750
+  -D MR_LRPROOF_DELAY_MS=750
 ; Live announces are enough for this single-hop field exercise. Do not define
 ; RNS_PERSIST_PATHS here: the LittleFS-backed path_store compactor can leave an
 ; active segment FD open while unlinking /path_store_*.dat on ESP32.