diff --git a/booking.variety_admin.inc b/booking.variety_admin.inc
index 0699807..e3f3945 100644
--- a/booking.variety_admin.inc
+++ b/booking.variety_admin.inc
@@ -641,6 +641,7 @@ function booking_varietysessions_csv_report($timeslot_id) {
 
   $sheetname = "Variety Session " . $timeslot_id;
   $writer = new XLSXWriter();
+  $writer->setFontName('Calibri'); //default document font name
   $writer->setAuthor($event->booking_eventname); 
   //Add the header row
   $writer->writeSheetHeader($sheetname, $column_headings, $header_style);