diff --git a/ArduSub/GCS_Sub.cpp b/ArduSub/GCS_Sub.cpp
index 9834bf71dc..52b342f8b9 100644
--- a/ArduSub/GCS_Sub.cpp
+++ b/ArduSub/GCS_Sub.cpp
@@ -71,7 +71,7 @@ void GCS_Sub::update_vehicle_sensor_status_flags()
 #endif
 
 #if AP_TERRAIN_AVAILABLE && AC_TERRAIN
-    switch (terrain.status()) {
+    switch (sub.terrain.status()) {
     case AP_Terrain::TerrainStatusDisabled:
         break;
     case AP_Terrain::TerrainStatusUnhealthy: