diff --git a/boards/px4/fmu-v5x/src/board_config.h b/boards/px4/fmu-v5x/src/board_config.h
index e9a81d282a..18922e2f39 100644
--- a/boards/px4/fmu-v5x/src/board_config.h
+++ b/boards/px4/fmu-v5x/src/board_config.h
@@ -140,7 +140,9 @@
 #define PX4_SPI_BUS_SENSORS1   1
 #define PX4_SPI_BUS_SENSORS2   2
 #define PX4_SPI_BUS_SENSORS3   3
-#define PX4_SPI_BUS_MAG        4
+#define PX4_SPI_BUS_SENSORS4   4
+
+#define PX4_SPI_BUS_MAG        PX4_SPI_BUS_SENSORS4
 #define PX4_SPI_BUS_MEMORY     5
 #define PX4_SPI_BUS_EXTERNAL1  6