diff --git a/src/drivers/boards/px4fmu-v4pro/board_config.h b/src/drivers/boards/px4fmu-v4pro/board_config.h
index dce1dabfb2..6440e67732 100644
--- a/src/drivers/boards/px4fmu-v4pro/board_config.h
+++ b/src/drivers/boards/px4fmu-v4pro/board_config.h
@@ -58,6 +58,7 @@ __BEGIN_DECLS
  ****************************************************************************************************/
 
 /* PX4IO connection configuration */
+#define BOARD_USES_PX4IO_VERSION       2
 #define PX4IO_SERIAL_DEVICE     "/dev/ttyS4"
 #define PX4IO_SERIAL_TX_GPIO    GPIO_USART6_TX
 #define PX4IO_SERIAL_RX_GPIO    GPIO_USART6_RX