diff --git a/mk/PX4/ROMFS/init.d/rc.APM b/mk/PX4/ROMFS/init.d/rc.APM
index 7065d03a52..8b07c7911a 100644
--- a/mk/PX4/ROMFS/init.d/rc.APM
+++ b/mk/PX4/ROMFS/init.d/rc.APM
@@ -134,7 +134,7 @@ else
     then
         set HAVE_PX4IO true
         # play happy tune again
-	tone_alarm start
+	tone_alarm 1
     fi
 fi
 
diff --git a/mk/PX4/ROMFS/init.d/rcS b/mk/PX4/ROMFS/init.d/rcS
index cc97f47816..fea2222cdb 100755
--- a/mk/PX4/ROMFS/init.d/rcS
+++ b/mk/PX4/ROMFS/init.d/rcS
@@ -43,7 +43,7 @@ then
 	echo "[init] card mounted at /fs/microsd"
         set HAVE_MICROSD 1
 	# Start playing the startup tune
-	tone_alarm start
+	tone_alarm 1
 else
         set HAVE_MICROSD 0
 	echo "Trying format of microSD"
@@ -55,7 +55,7 @@ else
                 then
                         echo "format succeeded"
                         set HAVE_MICROSD 1
-                        tone_alarm start
+                        tone_alarm 1
                 else
                         echo "mount failed"
                         tone_alarm MNBG