diff --git a/src/main.js b/src/main.js
index 45714a4..7309700 100644
--- a/src/main.js
+++ b/src/main.js
@@ -16,6 +16,10 @@ async function init() {
     console.error('Failed to load country borders:', error)
   }
 
+  if (!window.viewer) {
+    window.viewer = window.potreeViewer
+  }
+
   window.potreeViewer = await createPotreeViewer(
     'potree_render_area',
     POTREE_POINTCLOUD_URLS,