diff --git a/sapl/materia/models.py b/sapl/materia/models.py
index a975a36dd..fc1ee43c0 100644
--- a/sapl/materia/models.py
+++ b/sapl/materia/models.py
@@ -416,7 +416,7 @@ class DocumentoAcessorio(models.Model):
                              on_delete=models.PROTECT,
                              verbose_name=_('Tipo'))
     nome = models.CharField(max_length=50, verbose_name=_('Nome'))
-    data = models.DateField(blank=True, null=True, verbose_name=_('Data'))
+    data = models.DateField(blank=True, verbose_name=_('Data'))
     autor = models.CharField(
         max_length=50, blank=True, verbose_name=_('Autor'))
     ementa = models.TextField(blank=True, verbose_name=_('Ementa'))