diff --git a/build_flags_template.sh b/build_flags_template.sh
index 395d0b4..e66e237 100644
--- a/build_flags_template.sh
+++ b/build_flags_template.sh
@@ -10,7 +10,7 @@
  export FLAGS="$FLAGS -DSERIAL_BAUD=115200"
  #export FLAGS="$FLAGS -DWiz5500"
  #export FLAGS="$FLAGS -DDISABLE_FREERAM_PRINT"
- export FLAGS="$FLAGS -DCUSTOM_FIRMWARE_MAC=de:ad:be:ef:fe:00"
+ export FLAGS="$FLAGS -DCUSTOM_FIRMWARE_MAC=de:ad:be:ef:fe:ff"
 # export FLAGS="$FLAGS -DDMX_DISABLE"
 # export FLAGS="$FLAGS -DMODBUS_DISABLE"
 # export FLAGS="$FLAGS -DOWIRE_DISABLE"
@@ -26,4 +26,4 @@
 # export FLAGS="$FLAGS -DRESTART_LAN_ON_MQTT_ERRORS"
 # export FLAGS="$FLAGS -DW5500_CS_PIN=53"
  export FLAGS="$FLAGS -DPIO_SRC_REV="$(git log --pretty=format:%h_%ad -1 --date=short)
- echo $FLAGS
\ No newline at end of file
+ echo $FLAGS