diff --git a/sapl/comissoes/migrations/0009_auto_20161011_0843.py b/sapl/comissoes/migrations/0009_auto_20161011_0843.py
new file mode 100644
index 000000000..4fb4fde79
--- /dev/null
+++ b/sapl/comissoes/migrations/0009_auto_20161011_0843.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.7 on 2016-10-11 11:43
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('comissoes', '0008_auto_20160929_1611'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='participacao',
+            name='titular',
+            field=models.BooleanField(choices=[(True, 'Sim'), (False, 'Não')], default=False, verbose_name='Titular'),
+        ),
+    ]
diff --git a/sapl/comissoes/models.py b/sapl/comissoes/models.py
index ee3f72e6f..2036c76c0 100644
--- a/sapl/comissoes/models.py
+++ b/sapl/comissoes/models.py
@@ -133,7 +133,10 @@ class Participacao(models.Model):  # ComposicaoComissao
     composicao = models.ForeignKey(Composicao, related_name='participacao_set')
     parlamentar = models.ForeignKey(Parlamentar)
     cargo = models.ForeignKey(CargoComissao)
-    titular = models.BooleanField(verbose_name=_('Titular'))
+    titular = models.BooleanField(
+        verbose_name=_('Titular'),
+        default=False,
+        choices=YES_NO_CHOICES)
     data_designacao = models.DateField(verbose_name=_('Data Designação'))
     data_desligamento = models.DateField(blank=True,
                                          null=True,