diff --git a/mk/PX4/ROMFS/init.d/rc.APM b/mk/PX4/ROMFS/init.d/rc.APM
index 5a9010f87b..671fcf9bd0 100644
--- a/mk/PX4/ROMFS/init.d/rc.APM
+++ b/mk/PX4/ROMFS/init.d/rc.APM
@@ -319,9 +319,14 @@ then
 fi
 
 # optional Range Finder sensor
-if ll40ls start
+if ll40ls -X start
 then
-    echo "Found ll40ls sensor"
+    echo "Found external ll40ls sensor"
+fi
+
+if ll40ls -I start
+then
+    echo "Found internal ll40ls sensor"
 fi
 
 if mb12xx start