diff --git a/src/main.c b/src/main.c
index 3311f4e..1fc9a0d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -17,6 +17,7 @@
 #include "measurement.h"
 #include "deepsleep.h"
 #include "bmp280.h"
+#include "addon_io.h"
 
 #include "pinout.h"
 #include "flash_config.h"
@@ -304,6 +305,7 @@ int main(void)
 	init_clock();
 	init_rtc();
 
+	addon_io_init();
 	rs485_init();
 	charge_pump_init();
 	power_switch_init();