diff --git a/MediaBrowser.Api/Playback/BaseStreamingService.cs b/MediaBrowser.Api/Playback/BaseStreamingService.cs
index 8cdfc04f60..4f85f1922e 100644
--- a/MediaBrowser.Api/Playback/BaseStreamingService.cs
+++ b/MediaBrowser.Api/Playback/BaseStreamingService.cs
@@ -324,7 +324,7 @@ namespace MediaBrowser.Api.Playback
 
                 if (!hasFixedResolution)
                 {
-                    param += " crf18";
+                    param += " -crf 18";
                 }
             }
 
@@ -336,7 +336,7 @@ namespace MediaBrowser.Api.Playback
 
                 if (!hasFixedResolution)
                 {
-                    param += " crf18";
+                    param += " -crf 18";
                 }
             }