diff --git a/src/modules/uORB/topics/vehicle_global_position.h b/src/modules/uORB/topics/vehicle_global_position.h
index 6cbe25fbd9..c3bb3b8936 100644
--- a/src/modules/uORB/topics/vehicle_global_position.h
+++ b/src/modules/uORB/topics/vehicle_global_position.h
@@ -73,6 +73,7 @@ struct vehicle_global_position_s {
 	float eph;			/**< Standard deviation of position estimate horizontally */
 	float epv;			/**< Standard deviation of position vertically */
 	float terrain_alt;		/**< Terrain altitude in m, WGS84 */
+	bool terrain_alt_valid;		/**< Terrain altitude estimate is valid */
 };
 
 /**