diff --git a/render_gongs.py b/render_gongs.py
index 2bbca62..b6d27dc 100755
--- a/render_gongs.py
+++ b/render_gongs.py
@@ -128,5 +128,5 @@ if __name__ == '__main__':
     data = get_gongs(seq, {}, duration, tracks)
     mix_gongs(data, output)
     with open(output + '.json', 'w') as fd:
-        json.dump(result, fd, indent=4, sort_keys=True)
+        json.dump(data, fd, indent=4, sort_keys=True)
     print('render_gongs of %s took %s' % (output, time.time()-t0))