diff --git a/marietje/stats/utils.py b/marietje/stats/utils.py
index b9b8582..90f59e5 100644
--- a/marietje/stats/utils.py
+++ b/marietje/stats/utils.py
@@ -64,11 +64,11 @@ def compute_stats():
     return {
         'last_updated': last_updated,
         'total_uploads': total_uploads,
-        'upload_stats': upload_stats,
+        'upload_stats': list(upload_stats),
         'total_requests': total_requests,
-        'request_stats': request_stats,
-        'unique_request_stats': unique_request_stats,
-        'most_played_songs': most_played_songs,
-        'most_played_songs_14_days': most_played_songs_14_days,
+        'request_stats': list(request_stats),
+        'unique_request_stats': list(unique_request_stats),
+        'most_played_songs': list(most_played_songs),
+        'most_played_songs_14_days': list(most_played_songs_14_days),
         'stats_top_count': settings.STATS_TOP_COUNT,
     }