diff --git a/ROMFS/px4fmu_common/init.d/rc.sensors b/ROMFS/px4fmu_common/init.d/rc.sensors
index 536cfca91a..d9cdfa5dc0 100644
--- a/ROMFS/px4fmu_common/init.d/rc.sensors
+++ b/ROMFS/px4fmu_common/init.d/rc.sensors
@@ -111,7 +111,7 @@ else
 fi
 
 # Check for flow sensor
-if px4flow start
+if px4flow start &
 then
 fi