diff --git a/ROMFS/px4fmu_common/init.d/rcS b/ROMFS/px4fmu_common/init.d/rcS
index b1869386b3..287575bd4d 100644
--- a/ROMFS/px4fmu_common/init.d/rcS
+++ b/ROMFS/px4fmu_common/init.d/rcS
@@ -296,11 +296,13 @@ then
 	if ver hwcmp PX4FMU_V4
 	then
 		set MIXER_AUX none
+		param set SYS_FMU_TASK 1
 	fi
 
 	if ver hwcmp PX4FMU_V5
 	then
 		set MIXER_AUX none
+		param set SYS_FMU_TASK 1
 	fi
 
 	if ver hwcmp AEROFC_V1