diff --git a/static/reader/pdf.js b/static/reader/pdf.js
index 8f47db0..82da720 100644
--- a/static/reader/pdf.js
+++ b/static/reader/pdf.js
@@ -30,9 +30,18 @@ window.addEventListener('keydown', function(event) {
     }
 })
 
-window.addEventListener('pagerendered', function (event) {
-    loadAnnotations(event.detail.pageNumber - 1)
-})
+function bindEvents() {
+    if (!window.PDFViewerApplication || !window.PDFViewerApplication.eventBus) {
+        setTimeout(bindEvents, 10)
+        return
+    }
+    PDFViewerApplication.eventBus.on('pagerendered', function(event) {
+        var pageIndex = event.pageNumber - 1
+        loadAnnotations(pageIndex)
+    })
+}
+
+bindEvents()
 
 function getHighlight() {
     var pageIndex = PDFViewerApplication.pdfViewer.currentPageNumber - 1; 
@@ -112,12 +121,12 @@ function saveAnnotations() {
     localStorage[id + '.annotations'] = JSON.stringify(annotations)
 }
 
-function loadAnnotations(page) {
-    document.querySelectorAll('.oml-annotation.page' + page).forEach(function(e) {
+function loadAnnotations(pageIndex) {
+    document.querySelectorAll('.oml-annotation.page' + pageIndex).forEach(function(e) {
         e.remove()
     })
     annotations.filter(function(a) {
-        return a.page == page
+        return a.page == pageIndex
     }).forEach(function(annot) {
         renderAnnotation(annot)
     })