diff --git a/build_flags_mega2560.sh b/build_flags_mega2560.sh
index 8888949..7d7a269 100644
--- a/build_flags_mega2560.sh
+++ b/build_flags_mega2560.sh
@@ -27,6 +27,6 @@
 # export FLAGS="$FLAGS -DRESTART_LAN_ON_MQTT_ERRORS"
 # export FLAGS="$FLAGS -DW5500_CS_PIN=53"
 # export FLAGS="$FLAGS -DINTERVAL_CHECK_INPUT=20"
-# export FLAGS="$FLAGS -MODBUS_DIMMER_PARAM=SERIAL_8N1"
+# export FLAGS="$FLAGS -DMODBUS_DIMMER_PARAM=SERIAL_8N1"
  export FLAGS="$FLAGS -DPIO_SRC_REV="$(git log --pretty=format:%h_%ad -1 --date=short)
  echo $FLAGS