diff --git a/foxes.php b/foxes.php
index 3e79be8..e397a6a 100644
--- a/foxes.php
+++ b/foxes.php
@@ -92,7 +92,9 @@ function mime2ext($mime) {
             'audio/mpg'                                                                 => 'mp3',
             'audio/mpeg3'                                                               => 'mp3',
             'audio/mp3'                                                                 => 'mp3',
-            'video/mp4'                                                                 => 'mp4',
+	    'video/mp4'                                                                 => 'mp4',
+	    'video/x-matroska'                                                          => 'mkv',
+	    'video/mkv'                                                                 => 'mkv',
             'video/mpeg'                                                                => 'mpeg',
             'application/oda'                                                           => 'oda',
             'audio/ogg'                                                                 => 'ogg',