diff --git a/greg/models.py b/greg/models.py
index 54b31d6bbb1da3f475966fd635bc87b21b7cba47..9d5c7d75f572bcb6601b280805cabe5077886d3c 100644
--- a/greg/models.py
+++ b/greg/models.py
@@ -97,8 +97,7 @@ class PersonRole(BaseModel):
     # attached to the institution but does not have a guest account
     start_date = models.DateField(null=True)
     end_date = models.DateField()
-    # TODO Is this field needed?
-    contact_person_unit = models.TextField()
+    contact_person_unit = models.TextField(blank=True)
     comments = models.TextField(blank=True)
     available_in_search = models.BooleanField(default=False)
     registered_by = models.ForeignKey(