diff --git a/marietje/stats/utils.py b/marietje/stats/utils.py
index 5a276b7..8038090 100644
--- a/marietje/stats/utils.py
+++ b/marietje/stats/utils.py
@@ -121,7 +121,7 @@ def compute_stats():
         | Q(user_id__in=settings.STATS_REQUEST_IGNORE_USER_IDS)).aggregate(
             total=Sum('song__duration'))
 
-    total_time_overall = sum(x['avg_dur'] for x in time_requested)
+    total_time_overall = sum(x['avg_dur'] for x in list(time_requested))
     total_average = total_time_overall / len(time_requested)
     avg_dur_min, avg_dur_sec = divmod(total_average, 60)
     total_average = '{} minutes and {} seconds'.format(avg_dur_min, avg_dur_sec)