diff --git a/libraries/AP_Motors/AP_Motors6DOF.cpp b/libraries/AP_Motors/AP_Motors6DOF.cpp
index ca82fdba11..3a3bede637 100644
--- a/libraries/AP_Motors/AP_Motors6DOF.cpp
+++ b/libraries/AP_Motors/AP_Motors6DOF.cpp
@@ -184,8 +184,8 @@ void AP_Motors6DOF::setup_motors(motor_frame_class frame_class, motor_frame_type
     default:
         add_motor_raw_6dof(AP_MOTORS_MOT_1,     0,              0,              -1.0f,          0,                  1.0f,               0,              1);
         add_motor_raw_6dof(AP_MOTORS_MOT_2,     0,              0,              1.0f,           0,                  1.0f,               0,              2);
-        add_motor_raw_6dof(AP_MOTORS_MOT_3,     0,              0,              0,              -1.0f,              0,                  0,              3);
-        add_motor_raw_6dof(AP_MOTORS_MOT_4,     0,              0,              0,              -1.0f,              0,                  0,              4);
+        add_motor_raw_6dof(AP_MOTORS_MOT_3,     1.0f,           0,              0,              -1.0f,              0,                  0,              3);
+        add_motor_raw_6dof(AP_MOTORS_MOT_4,     -1.0f,          0,              0,              -1.0f,              0,                  0,              4);
         add_motor_raw_6dof(AP_MOTORS_MOT_5,     0,              0,              0,              0,                  0,                  1.0f,           5);
         break;
     }