diff --git a/flashcards/management/commands/notifyusers.py b/flashcards/management/commands/notifyusers.py
index 26ca296..7d8c436 100644
--- a/flashcards/management/commands/notifyusers.py
+++ b/flashcards/management/commands/notifyusers.py
@@ -8,7 +8,7 @@ class Command(BaseCommand):
     help = 'Notify the users if they have cards to be reviewed'
 
     def handle(self, *args, **options):
-        notify_list = UserFlashcard.objects.filter(
+        notify_list = UserFlashcard.objects.prefetch_related('user').filter(
             next_review__lte=Now()
         ).exclude(
             user__registration_id=None,