diff --git a/includes/mime_detect.inc b/includes/mime_detect.inc
index 67566743..74b87fd6 100644
--- a/includes/mime_detect.inc
+++ b/includes/mime_detect.inc
@@ -223,7 +223,6 @@ class MimeDetect {
     "tar" => "application/x-tar",
     "gtar" => "application/x-gtar",
     "zip" => "application/x-zip",
-    "rng" => "application/xml",
     // others:
     'bin' => 'application/octet-stream',
     // Web Archives: