diff --git a/firmware/config/boards/hellen/hellen72/board_configuration.cpp b/firmware/config/boards/hellen/hellen72/board_configuration.cpp
index edb6691b70..bcb960e24b 100644
--- a/firmware/config/boards/hellen/hellen72/board_configuration.cpp
+++ b/firmware/config/boards/hellen/hellen72/board_configuration.cpp
@@ -154,6 +154,7 @@ void setBoardDefaultConfiguration(void) {
 
 	engineConfiguration->acRelayPin = GPIOH_15;
 	engineConfiguration->acSwitch = GPIOB_0;
+	engineConfiguration->acSwitchMode = PI_PULLUP;
 
 	engineConfiguration->fuelPumpPin = GPIOG_2;	// OUT_IO9
 	engineConfiguration->idle.solenoidPin = GPIOD_14;	// OUT_PWM5