diff --git a/src/MissionManager/QGCMapPolygonVisuals.qml b/src/MissionManager/QGCMapPolygonVisuals.qml
index d24ff4c..c0bd2ee 100644
--- a/src/MissionManager/QGCMapPolygonVisuals.qml
+++ b/src/MissionManager/QGCMapPolygonVisuals.qml
@@ -177,8 +177,7 @@ Item {
         title:          qsTr("Select KML File")
         selectExisting: true
         nameFilters:    [ qsTr("KML files (*.kml)") ]
-
-
+        fileExtension:  "kml"
         onAcceptedForLoad: {
             mapPolygon.loadKMLFile(file)
             close()