diff --git a/openslides/motions/migrations/0003_auto_20150904_2029.py b/openslides/motions/migrations/0003_auto_20150904_2029.py
new file mode 100644
index 000000000..12f3fe2d3
--- /dev/null
+++ b/openslides/motions/migrations/0003_auto_20150904_2029.py
@@ -0,0 +1,19 @@
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('motions', '0002_auto_20150904_1448'),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='motionpoll',
+            unique_together=set([]),
+        ),
+        migrations.RemoveField(
+            model_name='motionpoll',
+            name='poll_number',
+        ),
+    ]
diff --git a/openslides/motions/models.py b/openslides/motions/models.py
index 3992832cf..74c11879e 100644
--- a/openslides/motions/models.py
+++ b/openslides/motions/models.py
@@ -397,9 +397,7 @@ class Motion(RESTModelMixin, models.Model):
         Return the new poll object.
         """
         if self.state.allow_create_poll:
-            # TODO: auto increment the poll_number in the database
-            poll_number = self.polls.aggregate(Max('poll_number'))['poll_number__max'] or 0
-            poll = MotionPoll.objects.create(motion=self, poll_number=poll_number + 1)
+            poll = MotionPoll.objects.create(motion=self)
             poll.set_options()
             return poll
         else:
@@ -678,18 +676,11 @@ class MotionPoll(RESTModelMixin, CollectDefaultVotesMixin, BasePoll):
         ugettext_noop('Yes'), ugettext_noop('No'), ugettext_noop('Abstain')]
     """The possible anwers for the poll. 'Yes, 'No' and 'Abstain'."""
 
-    poll_number = models.PositiveIntegerField(default=1)
-    """An id for this poll in realation to a motion.
-
-    Is unique for each motion.
-    """
-
-    class Meta:
-        unique_together = ("motion", "poll_number")
-
     def __str__(self):
-        """Return a string, representing the poll."""
-        return _('Vote %d') % self.poll_number
+        """
+        Representation method only for debugging purposes.
+        """
+        return 'MotionPoll for motion %s' % self.motion
 
     def set_options(self):
         """Create the option class for this poll."""
diff --git a/tests/old/motions/test_models.py b/tests/old/motions/test_models.py
index d284a9c20..e9e0cc565 100644
--- a/tests/old/motions/test_models.py
+++ b/tests/old/motions/test_models.py
@@ -61,11 +61,6 @@ class ModelTest(TestCase):
         self.motion.supporters.remove(self.test_user)
         self.assertFalse(self.motion.is_supporter(self.test_user))
 
-    def test_poll(self):
-        self.motion.state = State.objects.get(pk=1)
-        poll = self.motion.create_poll()
-        self.assertEqual(poll.poll_number, 1)
-
     def test_state(self):
         self.motion.reset_state()
         self.assertEqual(self.motion.state.name, 'submitted')