diff --git a/djangorestframework/resources.py b/djangorestframework/resources.py
index 1ac6eeac3..adf5c1c3d 100644
--- a/djangorestframework/resources.py
+++ b/djangorestframework/resources.py
@@ -223,7 +223,7 @@ class FormResource(Resource):
 
         # In addition to regular validation we also ensure no additional fields are being passed in...
         unknown_fields = seen_fields_set - (form_fields_set | allowed_extra_fields_set)
-        unknown_fields = unknown_fields - set(('csrfmiddlewaretoken',))
+        unknown_fields = unknown_fields - set(('csrfmiddlewaretoken', '_accept'))  # TODO: Ugh.
 
         # Check using both regular validation, and our stricter no additional fields rule
         if bound_form.is_valid() and not unknown_fields: