diff --git a/libraries/AP_Vehicle/AP_Vehicle.h b/libraries/AP_Vehicle/AP_Vehicle.h
index ba224155bc..c5e6cdaa00 100644
--- a/libraries/AP_Vehicle/AP_Vehicle.h
+++ b/libraries/AP_Vehicle/AP_Vehicle.h
@@ -43,6 +43,7 @@ public:
         AP_Int16 pitch_limit_min_cd;        
         AP_Int8  autotune_level;
         AP_Int8  stall_prevention;
+        AP_Int16 loiter_radius;
 
         struct Rangefinder_State {
             bool in_range:1;