diff --git a/rowers/management/commands/autojoin.py b/rowers/management/commands/autojoin.py
index 2debb9f3..107e8305 100644
--- a/rowers/management/commands/autojoin.py
+++ b/rowers/management/commands/autojoin.py
@@ -43,6 +43,7 @@ class Command(BaseCommand):
 
         for r in rs:
             workouts = Workout.objects.filter(user=r,
+                                              duplicate=False,
                                               startdatetime__gte=timezone.now()-datetime.timedelta(days=2))