diff --git a/renderer/lib/torrent-poster.js b/renderer/lib/torrent-poster.js
index 18e700f6..9e0f7463 100644
--- a/renderer/lib/torrent-poster.js
+++ b/renderer/lib/torrent-poster.js
@@ -7,7 +7,7 @@ function torrentPoster (torrent, cb) {
   // filter out file formats that the <video> tag definitely can't play
   var files = torrent.files.filter(function (file) {
     var extname = path.extname(file.name)
-    return ['.mp4', '.webm', '.mov', '.mkv'].indexOf(extname) !== -1
+    return ['.mp4', '.m4v', '.webm', '.mov', '.mkv'].indexOf(extname) !== -1
   })
 
   if (files.length === 0) return cb(new Error('cannot make screenshot for any files in torrent'))