diff --git a/django_pyvows/assertions/models.py b/django_pyvows/assertions/models.py
index da2db29..09ba856 100644
--- a/django_pyvows/assertions/models.py
+++ b/django_pyvows/assertions/models.py
@@ -23,6 +23,9 @@ class Model(object):
 def to_have_field(topic, field_name, field_class=None, **kwargs):
     from django.db import models
 
+    if isinstance(topic, Model):
+        topic = topic.model
+
     if isinstance(topic, models.Model):
         topic = topic.__class__
 
diff --git a/django_pyvows/version.py b/django_pyvows/version.py
index 102eb4c..f063762 100644
--- a/django_pyvows/version.py
+++ b/django_pyvows/version.py
@@ -8,4 +8,4 @@
 # http://www.opensource.org/licenses/mit-license
 # Copyright (c) 2011 Rafael Caricio rafael@caricio.com
 
-__version__ = (0, 3, 5)
+__version__ = (0, 3, 6)
diff --git a/vows/model_vows.py b/vows/model_vows.py
index 7d32b70..8f45377 100644
--- a/vows/model_vows.py
+++ b/vows/model_vows.py
@@ -32,6 +32,9 @@ class ModelVows(DjangoContext):
                 'name': 'something'
             })
 
+        def should_be_possible_to_use_the_assertion_in_model_instance(self, topic):
+            expect(topic).to_have_field('name')
+
         def should_have_a_method_to_call(self, topic):
             expect(hasattr(topic, '__call__')).to_be_true()