diff --git a/lib/mimetypes.list.php b/lib/mimetypes.list.php
index 8386bcb93f353d331a60e63aa78deefa49688ca9..77b97917583863de9e890b0d290c05006ff1c278 100644
--- a/lib/mimetypes.list.php
+++ b/lib/mimetypes.list.php
@@ -94,4 +94,5 @@ return array(
 	'sgf' => 'application/sgf',
 	'cdr' => 'application/coreldraw',
 	'impress' => 'text/impress',
+	'ai' => 'application/illustrator',
 );