diff --git a/sapl/base/models.py b/sapl/base/models.py
index eadd8e793..a5e94b321 100644
--- a/sapl/base/models.py
+++ b/sapl/base/models.py
@@ -20,7 +20,6 @@ class CasaLegislativa(models.Model):
 
     codigo = models.CharField(max_length=100,
                               blank=True,
-                              null=True,
                               verbose_name=_('Codigo'))
     nome = models.CharField(max_length=100, verbose_name=_('Nome'))
     sigla = models.CharField(max_length=100, verbose_name=_('Sigla'))