diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index 7986a4284a..7a4c15c3c1 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -912,11 +912,21 @@ class PhoneNumberField(IntegerField):
 class PositiveIntegerField(IntegerField):
     def get_manipulator_field_objs(self):
         return [oldforms.PositiveIntegerField]
+    
+    def formfield(self, **kwargs):
+        defaults = {'min_value': 0}
+        defaults.update(kwargs)
+        return super(PositiveIntegerField, self).formfield(**defaults) 
 
 class PositiveSmallIntegerField(IntegerField):
     def get_manipulator_field_objs(self):
         return [oldforms.PositiveSmallIntegerField]
 
+    def formfield(self, **kwargs):
+        defaults = {'min_value': 0}
+        defaults.update(kwargs)
+        return super(PositiveSmallIntegerField, self).formfield(**defaults) 
+
 class SlugField(CharField):
     def __init__(self, *args, **kwargs):
         kwargs['max_length'] = kwargs.get('max_length', 50)
diff --git a/tests/regressiontests/forms/models.py b/tests/regressiontests/forms/models.py
index e69de29bb2..f4f8607193 100644
--- a/tests/regressiontests/forms/models.py
+++ b/tests/regressiontests/forms/models.py
@@ -0,0 +1,21 @@
+from django.db import models
+
+class BoundaryModel(models.Model): 
+    positive_integer = models.PositiveIntegerField(null=True, blank=True)
+    
+__test__ = {'API_TESTS': """
+>>> from django.newforms import form_for_model
+
+# Boundary conditions on a PostitiveIntegerField #########################
+>>> BoundaryForm = form_for_model(BoundaryModel) 
+>>> f = BoundaryForm({'positive_integer':100}) 
+>>> f.is_valid() 
+True
+>>> f = BoundaryForm({'positive_integer':0}) 
+>>> f.is_valid() 
+True
+>>> f = BoundaryForm({'positive_integer':-100}) 
+>>> f.is_valid() 
+False
+
+"""}
\ No newline at end of file