diff --git a/sapl/materia/migrations/0063_auto_20191220_1351.py b/sapl/materia/migrations/0063_auto_20191220_1351.py
new file mode 100644
index 000000000..77194a87c
--- /dev/null
+++ b/sapl/materia/migrations/0063_auto_20191220_1351.py
@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.20 on 2019-12-20 16:51
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('materia', '0062_merge_20191209_1531'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='pautareuniao',
+            name='materia',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='materia_set', to='materia.MateriaLegislativa', verbose_name='Matéria'),
+        ),
+    ]
diff --git a/sapl/materia/models.py b/sapl/materia/models.py
index c373d98d6..b3fff4851 100644
--- a/sapl/materia/models.py
+++ b/sapl/materia/models.py
@@ -433,6 +433,7 @@ class PautaReuniao(models.Model):
     )
     materia = models.ForeignKey(
         MateriaLegislativa, related_name='materia_set',
+        on_delete=models.PROTECT,
         verbose_name=_('Matéria')
     )