diff --git a/index.js b/index.js
index 27bb0f1..f58125a 100644
--- a/index.js
+++ b/index.js
@@ -71,7 +71,7 @@ var ReactHTMLTableToExcel = function (_Component) {
 
       var table = document.getElementById(this.props.table).outerHTML;
       var sheet = String(this.props.sheet);
-      var filename = String(this.props.filename) + '.xls';
+      var filename = String(this.props.filename) + '.xlsx';
 
       var uri = 'data:application/vnd.ms-excel;base64,';
       var template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-mic' + 'rosoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"><head><meta cha' + 'rset="UTF-8"><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:Exce' + 'lWorksheet><x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/>' + '</x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></' + 'xml><![endif]--></head><body>{table}</body></html>';
