diff --git a/app/assets/javascripts/index.js b/app/assets/javascripts/index.js
index 59335ff84..11523df39 100644
--- a/app/assets/javascripts/index.js
+++ b/app/assets/javascripts/index.js
@@ -24,6 +24,10 @@ $(document).ready(function () {
 
   map.hash = L.hash(map);
 
+  $(window).on('popstate', function() {
+    map.hash.update();
+  });
+
   var copyright = I18n.t('javascripts.map.copyright', {copyright_url: '/copyright'});
 
   var layers = [