diff --git a/youtube_dl/postprocessor/ffmpeg.py b/youtube_dl/postprocessor/ffmpeg.py
index 08c9e8f79..44b6c19f6 100644
--- a/youtube_dl/postprocessor/ffmpeg.py
+++ b/youtube_dl/postprocessor/ffmpeg.py
@@ -517,6 +517,8 @@ class FFmpegConcatPP(FFmpegPostProcessor):
         for path in files:
             os.remove(encodeFilename(path))
 
+        return True, info
+
 class FFmpegAudioFixPP(FFmpegPostProcessor):
     def run(self, info):
         filename = info['filepath']