diff --git a/js/previewplugin.js b/js/previewplugin.js
index 67835fee..dec4712a 100644
--- a/js/previewplugin.js
+++ b/js/previewplugin.js
@@ -54,7 +54,7 @@ var isSecureViewerAvailable = function () {
 			var shown = true;
 			var $iframe;
 			var viewer = OC.generateUrl('/apps/files_pdfviewer/?file={file}', {file: downloadUrl});
-			$iframe = $('<iframe id="pdframe" style="width:100%;height:100%;display:block;position:absolute;top:0;z-index:1041;left:0;" src="'+viewer+param+'" sandbox="allow-scripts allow-same-origin allow-popups allow-modals allow-top-navigation" allowfullscreen="true"/>');
+			$iframe = $('<iframe id="pdframe" style="width:100%;height:100%;display:block;position:absolute;top:0;z-index:1041;left:0;" src="'+viewer+param+'" sandbox="allow-scripts allow-same-origin allow-popups allow-modals allow-top-navigation allow-downloads" allowfullscreen="true"/>');
 
 			if(isFileList === true) {
 				FileList.setViewerMode(true);