diff --git a/ESP32-IDF_ESPNOW-Transmitter/main/config.h b/ESP32-IDF_ESPNOW-Transmitter/main/config.h
index 675323bdc..e8b976ba6 100644
--- a/ESP32-IDF_ESPNOW-Transmitter/main/config.h
+++ b/ESP32-IDF_ESPNOW-Transmitter/main/config.h
@@ -31,6 +31,7 @@
 
 extern uint8_t broadcast_mac[ESP_NOW_ETH_ALEN];
 extern uint8_t receiver_mac[ESP_NOW_ETH_ALEN];
+extern uint8_t receiver_2_mac[ESP_NOW_ETH_ALEN];
 extern uint8_t transmitter_mac[ESP_NOW_ETH_ALEN];
 extern const char *TAG;
 #endif
\ No newline at end of file