diff --git a/server/initializers/constants.ts b/server/initializers/constants.ts
index b51ed8872..af70e7b88 100644
--- a/server/initializers/constants.ts
+++ b/server/initializers/constants.ts
@@ -770,7 +770,9 @@ function buildVideoMimetypeExt () {
         'video/x-flv': '.flv',
         'video/x-matroska': '.mkv',
         'application/octet-stream': '.mkv',
-        'video/avi': '.avi'
+        'video/avi': '.avi',
+        'video/x-m4v': '.m4v',
+        'video/m4v': '.m4v'
       })
     }