diff --git a/mk/PX4/ROMFS/init.d/rc.APM b/mk/PX4/ROMFS/init.d/rc.APM
index 5662756db5..65dc32c553 100644
--- a/mk/PX4/ROMFS/init.d/rc.APM
+++ b/mk/PX4/ROMFS/init.d/rc.APM
@@ -241,7 +241,7 @@ else
     else
         echo "No external hmc5883"
     fi
-    if hmc5883 -C -I -R 8 start
+    if hmc5883 -C -I -R 4 start
     then
         echo "Have internal hmc5883"
     else