diff --git a/src/annotator/index.ts b/src/annotator/index.ts
index e6ed85b0cab..116384924e3 100644
--- a/src/annotator/index.ts
+++ b/src/annotator/index.ts
@@ -80,7 +80,7 @@ function init() {
   });
   sidebarLinkElement.addEventListener('destroy', resolveUnloadRequested);
 
-  const hostFrame = annotatorConfig.subFrameIdentifier ? window.parent : window;
+  const hostFrame = annotatorConfig.subFrameIdentifier ? window.top! : window;
 
   const destroyables = [] as Destroyable[];