diff --git a/jsonfield/fields.py b/jsonfield/fields.py
index 7079858..0a1587f 100644
--- a/jsonfield/fields.py
+++ b/jsonfield/fields.py
@@ -57,7 +57,8 @@ def value_from_object(self, obj):
 
     def formfield(self, **kwargs):
 
-        kwargs["form_class"] = JSONFormField
+        if "form_class" not in kwargs:
+            kwargs["form_class"] = JSONFormField
 
         field = super(JSONField, self).formfield(**kwargs)
 
diff --git a/setup.py b/setup.py
index 59593b6..a0fc211 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from distutils.core import setup
 setup(name='jsonfield',
-      version='0.8',
+      version='0.9',
       packages=['jsonfield'],
       license='MIT',
       long_description="A reusable Django field that allows you to store validated JSON in your model.")