diff --git a/includes/mime_detect.inc b/includes/mime_detect.inc
index 6a007ad7..4035afe5 100644
--- a/includes/mime_detect.inc
+++ b/includes/mime_detect.inc
@@ -162,7 +162,7 @@ class MimeDetect {
     "xpm" => "image/x-xpixmap",
     "xwd" => "image/x-windowdump",
     // videos:
-    "mpv" => "video/x-matroska",
+    "mkv" => "video/x-matroska",
     "mpeg" => "video/mpeg",
     "mpe" => "video/mpeg",
     "mpg" => "video/mpeg",