diff --git a/colloscope/models.py b/colloscope/models.py
index 958c71a..d96e2a9 100644
--- a/colloscope/models.py
+++ b/colloscope/models.py
@@ -318,7 +318,7 @@ class Colle(models.Model):
         """
         Renvoie le nombre d'étudiants inscrits à la colle en tenant compte des swaps.
         """
-        n_base = sum(len(group.members.count()) for group in self.groups.all())
+        n_base = sum(group.members.count() for group in self.groups.all())
         n_plus = len(Swap.objects.filter(enroll=True, colle=self))
         n_moins = len(Swap.objects.filter(enroll=False, colle=self))