diff --git a/apps/participation/management/commands/fix_sympa_lists.py b/apps/participation/management/commands/fix_sympa_lists.py
index 9b335e7..ff0c1f0 100644
--- a/apps/participation/management/commands/fix_sympa_lists.py
+++ b/apps/participation/management/commands/fix_sympa_lists.py
@@ -38,6 +38,6 @@ class Command(BaseCommand):
             sympa.subscribe(team.email, "equipes-non-valides", f"Equipe {team.name}", True)
 
         for student in StudentRegistration.objects.filter(team__isnull=False).all():
-            sympa.subscribe(student.user.email, f"equipe-{student.team.trigram.lower}", True, f"{student}")
+            sympa.subscribe(student.user.email, f"equipe-{student.team.trigram.lower()}", True, f"{student}")
         for coach in CoachRegistration.objects.filter(team__isnull=False).all():
-            sympa.subscribe(coach.user.email, f"equipe-{coach.team.trigram.lower}", True, f"{coach}")
+            sympa.subscribe(coach.user.email, f"equipe-{coach.team.trigram.lower()}", True, f"{coach}")