diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index fc36be56f..3fbbf3ba0 100644
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -751,6 +751,7 @@ class YoutubeDL(object):
         if self.params.get('forceformat', False):
             self.to_stdout(info_dict['format'])
         if self.params.get('forcejson', False):
+            info_dict['_filename'] = filename
             self.to_stdout(json.dumps(info_dict))
 
         # Do nothing else if in simulate mode