diff --git a/frontend/App.vue b/frontend/App.vue
index 1dc17df..d36ba13 100644
--- a/frontend/App.vue
+++ b/frontend/App.vue
@@ -1473,6 +1473,13 @@ export default {
         }
     },
     load_wikidata_items(bounds) {
+      bounds ||= this.map.getBounds();
+      var this_update = this.map_update_number += 1;
+
+      for(const b of this.bounds_done) {
+        if (b.contains(bounds)) return;  // already done
+      }
+
       this.load_button_pressed = true;
       this.wikidata_loaded = false;
       this.osm_loaded = false;
@@ -1607,6 +1614,8 @@ export default {
         if (!item.wikidata) missing_qids.push(qid);
       }
 
+      this.bounds_done.push(this.map.getBounds());
+
       if (missing_qids.length == 0) {
         this.update_wikidata();
         this.check_for_missing_done = true;