diff --git a/firmware/config/boards/hellen/hellen72/board.mk b/firmware/config/boards/hellen/hellen72/board.mk
index 32a5907b79..c614c7131e 100644
--- a/firmware/config/boards/hellen/hellen72/board.mk
+++ b/firmware/config/boards/hellen/hellen72/board.mk
@@ -17,6 +17,8 @@ ifeq ($(LED_COMMUNICATION_BRAIN_PIN),)
   LED_COMMUNICATION_BRAIN_PIN = -DEFI_COMMUNICATION_PIN=GPIOH_10
 endif
 
+DDEFS += -DEFI_MAIN_RELAY_CONTROL=TRUE
+
 # Add them all together
 DDEFS += -DEFI_USE_OSC=TRUE -DFIRMWARE_ID=\"hellen72\" $(DEFAULT_ENGINE_TYPE) $(LED_CRITICAL_ERROR_BRAIN_PIN) $(LED_COMMUNICATION_BRAIN_PIN)
 # -DEFI_SOFTWARE_KNOCK=TRUE -DSTM32_ADC_USE_ADC3=TRUE