diff --git a/timesheet/inc/class.timesheet_export_csv.inc.php b/timesheet/inc/class.timesheet_export_csv.inc.php
index 2dd167d2ce..edce3d97a4 100644
--- a/timesheet/inc/class.timesheet_export_csv.inc.php
+++ b/timesheet/inc/class.timesheet_export_csv.inc.php
@@ -71,6 +71,10 @@ class timesheet_export_csv implements importexport_iface_export_plugin {
 		return 'csv';
 	}
 
+	public static function get_mimetype() {
+                return 'text/csv';
+        }
+
 	/**
 	 * return html for options.
 	 * this way the plugin has all opportunities for options tab
diff --git a/timesheet/inc/class.timesheet_export_openoffice.inc.php b/timesheet/inc/class.timesheet_export_openoffice.inc.php
index 72fcb9e38f..220e380bf6 100644
--- a/timesheet/inc/class.timesheet_export_openoffice.inc.php
+++ b/timesheet/inc/class.timesheet_export_openoffice.inc.php
@@ -178,6 +178,10 @@ class timesheet_export_openoffice implements importexport_iface_export_plugin {
 		return 'ods';
 	}
 
+	public static function get_mimetype() {
+		return 'application/vnd.oasis.opendocument.spreadsheet';
+	}
+
 	/**
 	 * return html for options.
 	 * this way the plugin has all opertunities for options tab