diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
index 72986818aa..e37dffabfb 100644
--- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
+++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
@@ -7494,7 +7494,7 @@ namespace MediaBrowser.Controller.MediaEncoding
                 else
                 {
                     // Progressive download - use faststart for proper seeking and duration
-                    format = " -f mp4 -movflags faststart";
+                    format = " -f mp4 -movflags +faststart";
                 }
             }