diff --git a/austritt/models.py b/austritt/models.py
index 2d00d0e..141d1b6 100644
--- a/austritt/models.py
+++ b/austritt/models.py
@@ -74,7 +74,7 @@ class Employee(models.Model):
     hardware = MultiSelectField(choices=HARDWARE_CHOICES.items(), max_length=40, null=True, blank=True, verbose_name=_("Zusätzliche Hardware vorhanden?"))
 
     # office related stuff
-    transponder_id = models.CharField(max_length=6, verbose_name=_("Transponder ID (Laut Personio)"))
+    transponder_id = models.CharField(max_length=6, blank=True, verbose_name=_("Transponder ID (Laut Personio)"))
 
     # finance related stuff
     credit_card = models.CharField(max_length=5, choices=JANEIN_CHOICES.items(), verbose_name="Kreditkarte vorhanden?")