diff --git a/ROMFS/px4fmu_common/init.d/rcS b/ROMFS/px4fmu_common/init.d/rcS
index 1c9fd9445b..ff873adac0 100644
--- a/ROMFS/px4fmu_common/init.d/rcS
+++ b/ROMFS/px4fmu_common/init.d/rcS
@@ -705,12 +705,17 @@ then
 # End of autostart
 fi
 
+# There is no further script processing, so we can free some RAM
+# XXX potentially unset all script variables.
+unset TUNE_ERR
+
 # Boot is complete, inform MAVLink app(s) that the system is now fully up and running
 mavlink boot_complete
 
-# Check for flow sensor - as it is a background task, launch it last
-if px4flow start &
+if ver hwcmp PX4FMU_V2
 then
+	# Check for flow sensor - as it is a background task, launch it last
+	px4flow start &
 fi
 
 if [ $EXIT_ON_END == yes ]
@@ -719,7 +724,3 @@ then
 	exit
 fi
 unset EXIT_ON_END
-
-# There is no further processing, so we can free some RAM
-# XXX potentially unset all script variables.
-unset TUNE_ERR