diff --git a/ROMFS/px4fmu_common/init.d/rc.sensors b/ROMFS/px4fmu_common/init.d/rc.sensors
index 5cf1ff3835..73f40c5039 100644
--- a/ROMFS/px4fmu_common/init.d/rc.sensors
+++ b/ROMFS/px4fmu_common/init.d/rc.sensors
@@ -39,5 +39,5 @@ then
 	#
 	# Check sensors - run AFTER 'sensors start'
 	#
-	preflight_check
+	preflight_check &
 fi
\ No newline at end of file