diff --git a/APMrover2/AP_MotorsUGV.cpp b/APMrover2/AP_MotorsUGV.cpp
index 3c09daf51f..b5ee5fb86e 100644
--- a/APMrover2/AP_MotorsUGV.cpp
+++ b/APMrover2/AP_MotorsUGV.cpp
@@ -342,7 +342,7 @@ void AP_MotorsUGV::output(bool armed, float ground_speed, float dt)
     output_custom_config(armed, _steering, _throttle, _lateral);
 
     // output to mainsail
-    output_mainsail(_mainsail);
+    output_mainsail();
 
     // send values to the PWM timers for output
     SRV_Channels::calc_pwm();
@@ -777,13 +777,13 @@ void AP_MotorsUGV::output_throttle(SRV_Channel::Aux_servo_function_t function, f
 }
 
 // output for sailboat's mainsail
-void AP_MotorsUGV::output_mainsail(float mainsail)
+void AP_MotorsUGV::output_mainsail()
 {
     if (!has_sail()) {
         return;
     }
 
-    SRV_Channels::set_output_scaled(SRV_Channel::k_mainsail_sheet, constrain_float(mainsail, 0.0f, 100.0f));
+    SRV_Channels::set_output_scaled(SRV_Channel::k_mainsail_sheet, _mainsail);
 }
 
 // slew limit throttle for one iteration
diff --git a/APMrover2/AP_MotorsUGV.h b/APMrover2/AP_MotorsUGV.h
index bf68e63e74..300249a1f9 100644
--- a/APMrover2/AP_MotorsUGV.h
+++ b/APMrover2/AP_MotorsUGV.h
@@ -137,7 +137,7 @@ protected:
     void output_throttle(SRV_Channel::Aux_servo_function_t function, float throttle, float dt = 0.0f);
 
     // output for sailboat's mainsail in the range of 0 to 100
-    void output_mainsail(float mainsail);
+    void output_mainsail();
 
     // slew limit throttle for one iteration
     void slew_limit_throttle(float dt);