diff --git a/demo/viewer/mainwindow.cpp b/demo/viewer/mainwindow.cpp
index 0b53586de..a4da2a683 100644
--- a/demo/viewer/mainwindow.cpp
+++ b/demo/viewer/mainwindow.cpp
@@ -185,6 +185,7 @@ void MainWindow::load_map_file(QString const& filename)
     }
     layerTab_->setModel(new LayerListModel(map,this));
     styleTab_->setModel(new StyleModel(map,this));
+    zoom_all();
 }
 
 void MainWindow::zoom_to_box()