diff --git a/ArduCopter/Parameters.h b/ArduCopter/Parameters.h
index a84e2f1546..532320fc8c 100644
--- a/ArduCopter/Parameters.h
+++ b/ArduCopter/Parameters.h
@@ -226,7 +226,7 @@ public:
 	AP_Int8		command_total;
 	AP_Int8		command_index;
 	AP_Int8		command_nav_index;
-	AP_Int8		waypoint_radius;
+	AP_Int16	waypoint_radius;
 	AP_Int16	loiter_radius;
 	AP_Int16	waypoint_speed_max;
 	AP_Float	crosstrack_gain;