diff --git a/sw/airborne/nav.c b/sw/airborne/nav.c
index 498d6d43f9..7599d6dc94 100644
--- a/sw/airborne/nav.c
+++ b/sw/airborne/nav.c
@@ -59,7 +59,7 @@ float carrot_x, carrot_y;
 /** Status on the current circle */
 float nav_circle_radians; /* Cumulated */
 float nav_circle_trigo_qdr; /* Angle from center to mobile */
-float nav_radius, nav_course, nav_shift;
+float nav_radius, nav_course, nav_climb, nav_shift;
 
 
 /** Status on the current leg (percentage, 0. < < 1.) in route mode */