diff --git a/components/ILIAS/File/classes/Preview/class.ilObjFilePreviewRendererGUI.php b/components/ILIAS/File/classes/Preview/class.ilObjFilePreviewRendererGUI.php
index 66a5453ddb60..a9e29f6011a7 100755
--- a/components/ILIAS/File/classes/Preview/class.ilObjFilePreviewRendererGUI.php
+++ b/components/ILIAS/File/classes/Preview/class.ilObjFilePreviewRendererGUI.php
@@ -293,7 +293,7 @@ private function getAsyncModal(): void
         $modal = $this->ui_factory->modal()->lightbox($pages);
 
         // Send response and end script
-        $response = $this->http->response()->withBody(Streams::ofString($this->ui_renderer->render($modal)));
+        $response = $this->http->response()->withBody(Streams::ofString($this->ui_renderer->renderAsync($modal)));
         $this->http->saveResponse($response);
         $this->http->sendResponse();
     }