diff --git a/sapl/sessao/migrations/0019_auto_20180404_1437.py b/sapl/sessao/migrations/0019_auto_20180404_1437.py
new file mode 100644
index 000000000..ed81011f1
--- /dev/null
+++ b/sapl/sessao/migrations/0019_auto_20180404_1437.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.13 on 2018-04-04 17:37
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sessao', '0018_auto_20180327_1433'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='tiporesultadovotacao',
+            name='natureza',
+            field=models.CharField(blank=True, choices=[('A', 'Aprovado'), ('R', 'Rejeitado')], max_length=1, verbose_name='Natureza do Tipo'),
+        ),
+    ]
diff --git a/sapl/sessao/models.py b/sapl/sessao/models.py
index 23155b51a..23f555cb6 100644
--- a/sapl/sessao/models.py
+++ b/sapl/sessao/models.py
@@ -225,9 +225,9 @@ class SessaoPlenaria(models.Model):
 @reversion.register()
 class AbstractOrdemDia(models.Model):
     TIPO_VOTACAO_CHOICES = Choices(
-        (1, 'simbolica', (('Simbólica'))),
-        (2, 'nominal', (('Nominal'))),
-        (3, 'secreta', (('Secreta'))),
+        (1, 'simbolica', 'Simbólica'),
+        (2, 'nominal', 'Nominal'),
+        (3, 'secreta', 'Secreta'),
     )
 
     sessao_plenaria = models.ForeignKey(SessaoPlenaria,
@@ -380,11 +380,13 @@ class PresencaOrdemDia(models.Model):  # OrdemDiaPresenca
 
 @reversion.register()
 class TipoResultadoVotacao(models.Model):
+    NATUREZA_CHOICES = Choices(
+        ('A', 'aprovado', 'Aprovado'),
+        ('R', 'rejeitado', 'Rejeitado'))
     nome = models.CharField(max_length=100, verbose_name=_('Nome do Tipo'))
-    natureza = models.CharField(max_length=100,
+    natureza = models.CharField(max_length=1,
                                 blank=True,
-                                choices=(('A', 'Aprovado'),
-                                         ('R', 'Rejeitado')),
+                                choices=NATUREZA_CHOICES,
                                 verbose_name=_('Natureza do Tipo'))
 
     class Meta: