diff --git a/www/js/app.js b/www/js/app.js
index 17a04914..c07905ab 100644
--- a/www/js/app.js
+++ b/www/js/app.js
@@ -95,11 +95,11 @@ define(['jquery', 'zimArchiveLoader', 'uiUtil', 'util', 'utf8', 'cache', 'images
             iframe.style.transform = 'translateY(-1px)';
             // iframe.style.height = window.innerHeight + 'px';
             // DEV: if we set the iframe with clientHeight, then it takes into account any zoom
-            iframe.style.height = document.documentElement.clientHeight-1 + 'px';
+            iframe.style.height = document.documentElement.clientHeight - 5 + 'px';
             // This is needed to cause a reflow in Zimit ZIMs
             setTimeout(function() {
                 iframe.style.height = document.documentElement.clientHeight + 'px';
-            }, 0);
+            }, 5);
 
             //Re-enable top-level scrolling
             scrollbox.style.height = window.innerHeight - navbarHeight + 'px';