diff --git a/boards/px4/fmu-v4/init/rc.board_sensors b/boards/px4/fmu-v4/init/rc.board_sensors
index 7bd416e871..0e066e7a9b 100644
--- a/boards/px4/fmu-v4/init/rc.board_sensors
+++ b/boards/px4/fmu-v4/init/rc.board_sensors
@@ -25,7 +25,7 @@ rm3100 -X start
 ms5611 -s start
 
 # hmc5883 internal SPI bus is rotated 90 deg yaw
-if ! hmc5883 -T -S -R 2 start
+if ! hmc5883 -T -s -R 2 start
 then
 	# lis3mdl internal SPI bus is rotated 90 deg yaw
 	lis3mdl -s start