diff --git a/ROMFS/scripts/rc.PX4IO b/ROMFS/scripts/rc.PX4IO
index 9a7509b1e6..3e91f7ef6e 100644
--- a/ROMFS/scripts/rc.PX4IO
+++ b/ROMFS/scripts/rc.PX4IO
@@ -22,6 +22,12 @@ fi
 #
 px4io start
 
+#
+# Load an appropriate mixer. FMU_pass.mix is a passthru mixer.
+# See ROMFS/mixers for a full list of mixers.
+#
+mixer load /dev/pwm_output /etc/mixers/FMU_pass.mix
+
 #
 # Start the sensors.
 #