diff --git a/fet2020/members/models.py b/fet2020/members/models.py
index 8740b318..c4ea5d37 100644
--- a/fet2020/members/models.py
+++ b/fet2020/members/models.py
@@ -88,7 +88,7 @@ class MemberManager(models.Manager):
 class Member(models.Model):
     firstname = models.CharField("Vorname", max_length=128)
     surname = models.CharField("Nachname", max_length=128)
-    nickname = models.CharField("Spitzname", max_length=128)
+    nickname = models.CharField("Spitzname", unique=True, max_length=128)
     mailaccount = models.CharField("Mailadresse", max_length=128)
 
     class MemberRole(models.TextChoices):