diff --git a/sheet.js b/sheet.js
index e63ffe7..08a77b2 100644
--- a/sheet.js
+++ b/sheet.js
@@ -1,6 +1,7 @@
-var sheetFront = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?><x:worksheet xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:x="http://schemas.openxmlformats.org/spreadsheetml/2006/main">' 
-		+ ' <x:sheetPr/><x:sheetViews><x:sheetView tabSelected="1" workbookViewId="0" /></x:sheetViews>' 
-		+ ' <x:sheetFormatPr defaultRowHeight="15" />';
+var sheetFront = '<?xml version="1.0" encoding="utf-8"?><x:worksheet xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:x="http://schemas.openxmlformats.org/spreadsheetml/2006/main" '
+  + 'xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac">'
+  + ' <x:sheetPr/><x:sheetViews><x:sheetView tabSelected="1" workbookViewId="0" /></x:sheetViews>'
+  + ' <x:sheetFormatPr defaultRowHeight="15" />';
 var sheetBack =' <x:pageMargins left="0.75" right="0.75" top="0.75" bottom="0.5" header="0.5" footer="0.75" />'
 		+ ' <x:headerFooter /></x:worksheet>';