diff --git a/ROMFS/px4fmu_common/init.d/rcS b/ROMFS/px4fmu_common/init.d/rcS
index 5e59707773..7d5446218b 100644
--- a/ROMFS/px4fmu_common/init.d/rcS
+++ b/ROMFS/px4fmu_common/init.d/rcS
@@ -52,6 +52,7 @@ set STARTUP_TUNE 1
 set STARTUP_TUNE_VOLUME ""
 set USE_IO no
 set VEHICLE_TYPE none
+set DATAMAN_ARGS ""
 
 #
 # Print full system version.
@@ -606,6 +607,7 @@ unset STARTUP_TUNE
 unset STARTUP_TUNE_VOLUME
 unset USE_IO
 unset VEHICLE_TYPE
+unset DATAMAN_ARGS
 
 #
 # Boot is complete, inform MAVLink app(s) that the system is now fully up and running.