diff --git a/booking.earlyaccess_admin.inc b/booking.earlyaccess_admin.inc
index 67a955d..3328f21 100644
--- a/booking.earlyaccess_admin.inc
+++ b/booking.earlyaccess_admin.inc
@@ -149,7 +149,7 @@ function booking_earlyaccess_csv_report() {
   $result = $codelist_query->execute();
 
   //calculate the header row for CSV
-  $header = implode( $delimiter, array_keys($data));
+  $header = implode( $delimiter, array_keys($result));
   $csv .= $header . "\n";
 
   //add the records