diff --git a/libraries/AP_Motors/AP_MotorsCoax.h b/libraries/AP_Motors/AP_MotorsCoax.h
index ff74f1ccd8..392b7f5e81 100644
--- a/libraries/AP_Motors/AP_MotorsCoax.h
+++ b/libraries/AP_Motors/AP_MotorsCoax.h
@@ -27,7 +27,7 @@ public:
     /// Constructor
     AP_MotorsCoax(uint16_t loop_rate, uint16_t speed_hz = AP_MOTORS_SPEED_DEFAULT) :
         AP_MotorsMulticopter(loop_rate, speed_hz),
-        _servo1(CH_1), _servo2(CH_2), _servo3(CH_3), _servo4(CH_4)
+        _servo1(CH_NONE), _servo2(CH_NONE), _servo3(CH_NONE), _servo4(CH_NONE)
     {
         AP_Param::setup_object_defaults(this, var_info);
     };