diff --git a/src/MissionManager/VisualMissionItem.cc b/src/MissionManager/VisualMissionItem.cc
index 70ccdbc5bce8b2957fba0ab34e63d03cfdb61967..0370a065335c6cfd6d84bec26961ad3f06e88132 100644
--- a/src/MissionManager/VisualMissionItem.cc
+++ b/src/MissionManager/VisualMissionItem.cc
@@ -195,9 +195,7 @@ void VisualMissionItem::_reallyUpdateTerrainAltitude(void)
 
 void VisualMissionItem::_terrainDataReceived(bool success, QList<double> heights)
 {
-    if (success) {
-        _terrainAltitude = heights[0];
-        emit terrainAltitudeChanged(_terrainAltitude);
-        sender()->deleteLater();
-    }
+    _terrainAltitude = success ? heights[0] : qQNaN();
+    emit terrainAltitudeChanged(_terrainAltitude);
+    sender()->deleteLater();
 }