diff --git a/src/app.tsx b/src/app.tsx
index 5200c5e..8ff04ee 100644
--- a/src/app.tsx
+++ b/src/app.tsx
@@ -264,7 +264,7 @@ export class App extends React.Component<RouteComponentProps, {}> {
         );
         const data =
           source === 'wikitree'
-            ? await loadWikiTree(indi!, handleCors)
+            ? await loadWikiTree(indi!)
             : hash
             ? await loadGedcom(hash, gedcom, images)
             : await loadFromUrl(url!, handleCors);
diff --git a/src/wikitree.ts b/src/wikitree.ts
index eecf060..1c75c46 100644
--- a/src/wikitree.ts
+++ b/src/wikitree.ts
@@ -94,10 +94,10 @@ async function getRelatives(keys: string[], handleCors: boolean) {
  * Loads data from WikiTree to populate an hourglass chart starting from the
  * given person ID.
  */
-export async function loadWikiTree(
-  key: string,
-  handleCors: boolean,
-): Promise<TopolaData> {
+export async function loadWikiTree(key: string): Promise<TopolaData> {
+  // Work around CORS if not in apps.wikitree.com domain.
+  const handleCors = window.location.hostname !== 'apps.wikitree.com';
+
   const everyone: Person[] = [];
 
   // Fetch the ancestors of the input person and ancestors of his/her spouses.