diff --git a/src/ffmpeg.rs b/src/ffmpeg.rs
index af6ad68..3ea6382 100644
--- a/src/ffmpeg.rs
+++ b/src/ffmpeg.rs
@@ -49,11 +49,6 @@ impl FFmpegCommandOptions {
             args.push(threads.to_string());
         }
 
-        if let Some(niceness) = self.niceness {
-            args.push("-threads".to_string());
-            args.push(niceness.to_string());
-        }
-
         if let Some(allow_overwrite) = self.overwrite {
             if allow_overwrite {
                 args.push("-y".to_string());