diff --git a/multi_page_viewer.js b/multi_page_viewer.js
index 66357716e..01d7b4f6e 100644
--- a/multi_page_viewer.js
+++ b/multi_page_viewer.js
@@ -43,12 +43,12 @@ var PDFViewer = {
   lastPagesDrawn: [],
   
   visiblePages: function() {
-    const pageBottomMargin = 20;
+    const pageBottomMargin = 10;
     var windowTop = window.pageYOffset;
     var windowBottom = window.pageYOffset + window.innerHeight;
 
     var pageHeight, page;
-    var i, n = PDFViewer.numberOfPages, currentHeight = 0;
+    var i, n = PDFViewer.numberOfPages, currentHeight = pageBottomMargin;
     for (i = 1; i <= n; i++) {
       var page = PDFViewer.pdf.getPage(i);
       pageHeight = PDFViewer.pageHeight(page) + pageBottomMargin;