diff --git a/libraries/AP_Motors/AP_Motors_Class.h b/libraries/AP_Motors/AP_Motors_Class.h
index 6b73b59db5..ed329c09d4 100644
--- a/libraries/AP_Motors/AP_Motors_Class.h
+++ b/libraries/AP_Motors/AP_Motors_Class.h
@@ -20,6 +20,10 @@
 #define AP_MOTORS_MOT_10 9U
 #define AP_MOTORS_MOT_11 10U
 #define AP_MOTORS_MOT_12 11U
+#define AP_MOTORS_MOT_13 12U
+#define AP_MOTORS_MOT_14 13U
+#define AP_MOTORS_MOT_15 14U
+#define AP_MOTORS_MOT_16 15U
 
 #ifndef AP_MOTORS_MAX_NUM_MOTORS
 #define AP_MOTORS_MAX_NUM_MOTORS 32