diff --git a/src/MissionManager/QGCMapPolygonVisuals.qml b/src/MissionManager/QGCMapPolygonVisuals.qml
index d24ff4c64bf53df66bfe8a63b51bbac662c5dc02..c0bd2ee7ba343c155f1b878d930e00f14349ad26 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()