diff --git a/web/js/pages/TerritoryPage.tsx b/web/js/pages/TerritoryPage.tsx
index 40901f1e..c101be19 100644
--- a/web/js/pages/TerritoryPage.tsx
+++ b/web/js/pages/TerritoryPage.tsx
@@ -22,7 +22,8 @@ const ShareButton = ({congregationId, territoryId, territoryNumber}) => {
   const togglePopup = async () => {
     if (!shareUrl) {
       const url = await shareTerritory(congregationId, territoryId);
-      setShareUrl(url + '/' + encodeURIComponent(territoryNumber).replaceAll(/%../g, "_"));
+      // TODO: change "#/" to a "/" after nobody has a cached page older than 2023-07-31, to avoid incompatibility with the old router
+      setShareUrl(url + '#/' + encodeURIComponent(territoryNumber).replaceAll(/%../g, "_"));
     }
     setOpen(!open);
   }