diff --git a/fet2020/members/models.py b/fet2020/members/models.py
index 35f686c9..07bff4a3 100644
--- a/fet2020/members/models.py
+++ b/fet2020/members/models.py
@@ -32,7 +32,7 @@ class Member(models.Model):
     nickname = models.CharField("Spitzname", max_length=128)
 
     # LDAP Username
-    username = models.CharField(max_length=128)
+    username = models.CharField(max_length=128, blank=True)
 
     # fet mail account
     mailaccount = models.CharField(