diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 358593b1bd..f38dd85428 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -1194,6 +1194,7 @@ function wp_check_filetype($filename, $mimes = null) {
 		'js' => 'application/javascript',
 		'pdf' => 'application/pdf',
 		'doc' => 'application/msword',
+		'odt' => 'application/vnd.oasis.opendocument.text',
 		'pot|pps|ppt' => 'application/vnd.ms-powerpoint',
 		'wri' => 'application/vnd.ms-write',
 		'xla|xls|xlt|xlw' => 'application/vnd.ms-excel',