diff --git a/404.html b/404.html
index aae798cb..10f0296b 100644
--- a/404.html
+++ b/404.html
@@ -25,10 +25,10 @@
       if (window.location == "https://mapknitter.org/") {
         window.location = "https://publiclab.github.io/Leaflet.DistortableImage/examples/archive";
       } else if (window.location.href.split('/')[4] == "embed") {
-        var path = "https://publiclab.github.io/Leaflet.DistortableImage/examples/archive?json=https://archive.org/download/mapknitter-wayback/" + document.location.href.split('.org/embed/')[1];
+        var path = "https://publiclab.github.io/Leaflet.DistortableImage/examples/archive?json=https://archive.org/download/mapknitter-wayback/" + document.location.href.split('.org/embed/')[1] + ".json";
         window.location = path;
       } else {
-        var path = "https://publiclab.github.io/Leaflet.DistortableImage/examples/archive?json=https://archive.org/download/mapknitter-wayback/" + document.location.href.split('.org/map/')[1];
+        var path = "https://publiclab.github.io/Leaflet.DistortableImage/examples/archive?json=https://archive.org/download/mapknitter-wayback/" + document.location.href.split('.org/map/')[1] + ".json";
         window.location = path;
       }
     </script>