diff --git a/web/app.js b/web/app.js
index d8962419d..40ec6796a 100644
--- a/web/app.js
+++ b/web/app.js
@@ -1742,6 +1742,7 @@ function webViewerPageRendered(evt) {
       PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
     PDFViewerApplication.externalServices.reportTelemetry({
       type: 'pageInfo',
+      timestamp: evt.timestamp,
     });
     // It is a good time to report stream and font types.
     PDFViewerApplication.pdfDocument.getStats().then(function (stats) {