diff --git a/ArduSub/radio.cpp b/ArduSub/radio.cpp
index a1495a799c..e79d4c7ac6 100644
--- a/ArduSub/radio.cpp
+++ b/ArduSub/radio.cpp
@@ -52,6 +52,7 @@ void Sub::init_rc_out()
     motors.set_update_rate(g.rc_speed);
     motors.set_loop_rate(scheduler.get_loop_rate_hz());
     motors.init((AP_Motors::motor_frame_class)g.frame_configuration.get(), AP_Motors::motor_frame_type::MOTOR_FRAME_TYPE_PLUS);
+    motors.convert_pwm_min_max_param(channel_throttle->get_radio_min(), channel_throttle->get_radio_max());
     motors.update_throttle_range();
 
     // enable output to motors