diff --git a/marietje/marietje/utils.py b/marietje/marietje/utils.py
index 1810ca0..8c6f03b 100644
--- a/marietje/marietje/utils.py
+++ b/marietje/marietje/utils.py
@@ -19,9 +19,8 @@ def song_to_dict(song, hash=False, user=False, replaygain=False):
         data['uploader_name'] = song.user.name
 
     if replaygain:
-        data['rg_gain'] = song.rg_gain,
-        data['rg_peak'] = song.rg_peak,
-
+        data['rg_gain'] = song.rg_gain
+        data['rg_peak'] = song.rg_peak
 
     return data