diff --git a/polymorphic/admin.py b/polymorphic/admin.py
index bb53e00..adf4df6 100644
--- a/polymorphic/admin.py
+++ b/polymorphic/admin.py
@@ -17,7 +17,7 @@ from django.utils.safestring import mark_safe
 from django.utils.translation import ugettext_lazy as _
 import abc
 
-__all__ = ('PolymorphicModelChoiceForm', 'PolymorphicParentModelAdmin')
+__all__ = ('PolymorphicModelChoiceForm', 'PolymorphicParentModelAdmin', 'PolymorphicChildModelAdmin')
 
 
 class PolymorphicModelChoiceForm(forms.Form):