diff --git a/ArduPlane/motor_test.cpp b/ArduPlane/motor_test.cpp
index 98b019a4e4..d5866772ff 100644
--- a/ArduPlane/motor_test.cpp
+++ b/ArduPlane/motor_test.cpp
@@ -57,7 +57,7 @@ void QuadPlane::motor_test_output()
         break;
 
     case MOTOR_TEST_THROTTLE_PILOT:
-        pwm = plane.channel_throttle->get_radio_in();
+        pwm = thr_min_pwm + (thr_max_pwm - thr_min_pwm) * (float)plane.channel_throttle->get_control_in()*0.01f;
         break;
 
     default: