diff --git a/graphene/core/types/objecttype.py b/graphene/core/types/objecttype.py
index 363d881b..9745d3c5 100644
--- a/graphene/core/types/objecttype.py
+++ b/graphene/core/types/objecttype.py
@@ -244,10 +244,8 @@ class InputObjectType(ObjectType):
 
     @classmethod
     def internal_type(cls, schema):
-        fields = lambda: OrderedDict([(f.name, schema.T(f))
-                                      for f in cls._meta.fields])
         return GraphQLInputObjectType(
             cls._meta.type_name,
             description=cls._meta.description,
-            fields=fields,
+            fields=partial(cls.get_fields, schema),
         )